diff --git a/frontend/src/components/LanguageSwitchSelect.vue b/frontend/src/components/LanguageSwitchSelect.vue
index b53b82a18..c547d9af3 100644
--- a/frontend/src/components/LanguageSwitchSelect.vue
+++ b/frontend/src/components/LanguageSwitchSelect.vue
@@ -14,9 +14,9 @@ export default {
     return {
       selected: null,
       options: [
-        { value: null, text: this.$t('setting.language.select_language') },
-        { value: 'de', text: this.$t('setting.language.de') },
-        { value: 'en', text: this.$t('setting.language.en') },
+        { value: null, text: this.$t('settings.language.select_language') },
+        { value: 'de', text: this.$t('settings.language.de') },
+        { value: 'en', text: this.$t('settings.language.en') },
       ],
     }
   },
diff --git a/frontend/src/locales/de.json b/frontend/src/locales/de.json
index ac9aa89d4..b43f4b4e5 100644
--- a/frontend/src/locales/de.json
+++ b/frontend/src/locales/de.json
@@ -76,7 +76,9 @@
     "to1": "an",
     "validation": {
       "gddSendAmount": "Das Feld {_field_} muss eine Zahl zwischen {min} und {max} mit höchstens zwei Nachkommastellen sein",
-      "is-not": "Du kannst dir selbst keine Gradidos überweisen"
+      "is-not": "Du kannst dir selbst keine Gradidos überweisen",
+      "usernmae-regex": "Der Username muss mit einem Buchstaben beginnen auf den mindestens zwei alfanumerische Zeichen folgen müssen.",
+      "usernmae-unique": "Der Username ist bereits vergeben."
     }
   },
   "gdt": {
@@ -102,7 +104,7 @@
   "message": "hallo gradido !!",
   "privacy_policy": "Datenschutzerklärung",
   "send": "Senden",
-  "setting": {
+  "settings": {
     "language": {
       "changeLanguage": "Sprache ändern",
       "de": "Deutsch",
diff --git a/frontend/src/locales/en.json b/frontend/src/locales/en.json
index 1967fc124..8dda1dfbe 100644
--- a/frontend/src/locales/en.json
+++ b/frontend/src/locales/en.json
@@ -76,7 +76,9 @@
     "to1": "to",
     "validation": {
       "gddSendAmount": "The {_field_} field must be a number between {min} and {max} with at most two digits",
-      "is-not": "You cannot send Gradidos to yourself"
+      "is-not": "You cannot send Gradidos to yourself",
+      "usernmae-regex": "The username must start with a letter, followed by at least two alphanumeric characters.",
+      "usernmae-unique": "The username is already taken."
     }
   },
   "gdt": {
@@ -102,7 +104,7 @@
   "message": "hello gradido !!",
   "privacy_policy": "Privacy policy",
   "send": "Send",
-  "setting": {
+  "settings": {
     "language": {
       "changeLanguage": "Change language",
       "de": "Deutsch",
diff --git a/frontend/src/views/Pages/ForgotPassword.spec.js b/frontend/src/views/Pages/ForgotPassword.spec.js
index 5f0311fcb..91247d8a6 100644
--- a/frontend/src/views/Pages/ForgotPassword.spec.js
+++ b/frontend/src/views/Pages/ForgotPassword.spec.js
@@ -39,11 +39,11 @@ describe('ForgotPassword', () => {
     })
 
     it('has a title', () => {
-      expect(wrapper.find('h1').text()).toEqual('setting.password.reset')
+      expect(wrapper.find('h1').text()).toEqual('settings.password.reset')
     })
 
     it('has a subtitle', () => {
-      expect(wrapper.find('p.text-lead').text()).toEqual('setting.password.subtitle')
+      expect(wrapper.find('p.text-lead').text()).toEqual('settings.password.subtitle')
     })
 
     describe('back button', () => {
diff --git a/frontend/src/views/Pages/ForgotPassword.vue b/frontend/src/views/Pages/ForgotPassword.vue
index c68b94a56..444e94495 100644
--- a/frontend/src/views/Pages/ForgotPassword.vue
+++ b/frontend/src/views/Pages/ForgotPassword.vue
@@ -5,8 +5,8 @@
         <div class="header-body text-center mb-7">
           <b-row class="justify-content-center">
             <b-col xl="5" lg="6" md="8" class="px-2">
-              <h1>{{ $t('setting.password.reset') }}</h1>
-              <p class="text-lead">{{ $t('setting.password.subtitle') }}</p>
+              <h1>{{ $t('settings.password.reset') }}</h1>
+              <p class="text-lead">{{ $t('settings.password.subtitle') }}</p>
             </b-col>
           </b-row>
         </div>
@@ -22,7 +22,7 @@
                   <input-email v-model="form.email"></input-email>
                   <div class="text-center">
                     <b-button type="submit" variant="primary">
-                      {{ $t('setting.password.send_now') }}
+                      {{ $t('settings.password.send_now') }}
                     </b-button>
                   </div>
                 </b-form>
diff --git a/frontend/src/views/Pages/Login.spec.js b/frontend/src/views/Pages/Login.spec.js
index 30f6cb4bd..7218384f7 100644
--- a/frontend/src/views/Pages/Login.spec.js
+++ b/frontend/src/views/Pages/Login.spec.js
@@ -71,7 +71,7 @@ describe('Login', () => {
     describe('links', () => {
       it('has a link "Forgot Password?"', () => {
         expect(wrapper.findAllComponents(RouterLinkStub).at(0).text()).toEqual(
-          'setting.password.forgot_pwd',
+          'settings.password.forgot_pwd',
         )
       })
 
diff --git a/frontend/src/views/Pages/Login.vue b/frontend/src/views/Pages/Login.vue
index 90fa5eb61..f5c6f025d 100755
--- a/frontend/src/views/Pages/Login.vue
+++ b/frontend/src/views/Pages/Login.vue
@@ -40,7 +40,7 @@
           <b-row class="mt-3">
             <b-col cols="6">
               <router-link to="/password">
-                {{ $t('setting.password.forgot_pwd') }}
+                {{ $t('settings.password.forgot_pwd') }}
               </router-link>
             </b-col>
             <b-col cols="6" class="text-right" v-show="allowRegister">
diff --git a/frontend/src/views/Pages/ResetPassword.spec.js b/frontend/src/views/Pages/ResetPassword.spec.js
index 2df1cd75e..bd1467524 100644
--- a/frontend/src/views/Pages/ResetPassword.spec.js
+++ b/frontend/src/views/Pages/ResetPassword.spec.js
@@ -71,9 +71,9 @@ describe('ResetPassword', () => {
       })
 
       it('has a message suggesting to contact the support', () => {
-        expect(wrapper.find('div.header').text()).toContain('setting.password.reset')
+        expect(wrapper.find('div.header').text()).toContain('settings.password.reset')
         expect(wrapper.find('div.header').text()).toContain(
-          'setting.password.reset-password.not-authenticated',
+          'settings.password.reset-password.not-authenticated',
         )
       })
     })
@@ -101,9 +101,9 @@ describe('ResetPassword', () => {
 
       describe('Register header', () => {
         it('has a welcome message', async () => {
-          expect(wrapper.find('div.header').text()).toContain('setting.password.reset')
+          expect(wrapper.find('div.header').text()).toContain('settings.password.reset')
           expect(wrapper.find('div.header').text()).toContain(
-            'setting.password.reset-password.text',
+            'settings.password.reset-password.text',
           )
         })
       })
diff --git a/frontend/src/views/Pages/ResetPassword.vue b/frontend/src/views/Pages/ResetPassword.vue
index f72100600..81b3d7df7 100644
--- a/frontend/src/views/Pages/ResetPassword.vue
+++ b/frontend/src/views/Pages/ResetPassword.vue
@@ -5,13 +5,13 @@
         <div class="header-body text-center mb-7">
           <b-row class="justify-content-center">
             <b-col xl="5" lg="6" md="8" class="px-2">
-              <h1>{{ $t('setting.password.reset') }}</h1>
+              <h1>{{ $t('settings.password.reset') }}</h1>
               <div class="pb-4" v-if="!pending">
                 <span v-if="authenticated">
-                  {{ $t('setting.password.reset-password.text') }}
+                  {{ $t('settings.password.reset-password.text') }}
                 </span>
                 <span v-else>
-                  {{ $t('setting.password.reset-password.not-authenticated') }}
+                  {{ $t('settings.password.reset-password.not-authenticated') }}
                 </span>
               </div>
             </b-col>
@@ -29,7 +29,7 @@
                   <input-password-confirmation v-model="form" :register="register" />
                   <div class="text-center">
                     <b-button type="submit" variant="primary" class="mt-4">
-                      {{ $t('setting.password.reset') }}
+                      {{ $t('settings.password.reset') }}
                     </b-button>
                   </div>
                 </b-form>
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.spec.js b/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.spec.js
index 0c7cae799..927f1d29d 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.spec.js
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.spec.js
@@ -139,7 +139,7 @@ describe('UserCard_FormUserData', () => {
         })
 
         it('toasts a success message', () => {
-          expect(toastSuccessMock).toBeCalledWith('setting.name.change-success')
+          expect(toastSuccessMock).toBeCalledWith('settings.name.change-success')
         })
 
         it('has an edit button again', () => {
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.vue b/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.vue
index 0cd8ba965..b3cee1ef5 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.vue
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserData.vue
@@ -4,7 +4,7 @@
       <b-row class="mb-4 text-right">
         <b-col class="text-right">
           <a @click="showUserData ? (showUserData = !showUserData) : cancelEdit()">
-            <span class="pointer mr-3">{{ $t('setting.name.change-name') }}</span>
+            <span class="pointer mr-3">{{ $t('settings.name.change-name') }}</span>
             <b-icon v-if="showUserData" class="pointer ml-3" icon="pencil"></b-icon>
             <b-icon v-else icon="x-circle" class="pointer ml-3" variant="danger"></b-icon>
           </a>
@@ -122,7 +122,7 @@ export default {
           this.$store.commit('lastName', this.form.lastName)
           this.$store.commit('description', this.form.description)
           this.showUserData = true
-          this.$toasted.success(this.$t('setting.name.change-success'))
+          this.$toasted.success(this.$t('settings.name.change-success'))
         })
         .catch((error) => {
           this.$toasted.error(error.message)
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.spec.js b/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.spec.js
index 048f12ff1..372a1ba1f 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.spec.js
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.spec.js
@@ -47,7 +47,7 @@ describe('UserCard_FormUserPasswort', () => {
     })
 
     it('has a change password button with text "form.change-password"', () => {
-      expect(wrapper.find('a').text()).toEqual('setting.password.change-password')
+      expect(wrapper.find('a').text()).toEqual('settings.password.change-password')
     })
 
     it('has a change password button with a pencil icon', () => {
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.vue b/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.vue
index 5095f7b74..1f6c34c26 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.vue
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUserPasswort.vue
@@ -4,7 +4,7 @@
       <b-row class="mb-4 text-right">
         <b-col class="text-right">
           <a @click="showPassword ? (showPassword = !showPassword) : cancelEdit()">
-            <span class="pointer mr-3">{{ $t('setting.password.change-password') }}</span>
+            <span class="pointer mr-3">{{ $t('settings.password.change-password') }}</span>
             <b-icon v-if="showPassword" class="pointer ml-3" icon="pencil"></b-icon>
             <b-icon v-else icon="x-circle" class="pointer ml-3" variant="danger"></b-icon>
           </a>
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js
index 4c667d782..a55c223d7 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js
@@ -125,7 +125,7 @@ describe('UserCard_FormUsername', () => {
           })
 
           it('toasts an success message', () => {
-            expect(toastSuccessMock).toBeCalledWith('setting.name.change-success')
+            expect(toastSuccessMock).toBeCalledWith('settings.name.change-success')
           })
 
           it('has no edit button anymore', () => {
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.vue b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.vue
index eae499c07..f9d46bbba 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.vue
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.vue
@@ -98,7 +98,7 @@ export default {
           this.$store.commit('username', this.form.username)
           this.username = this.form.username
           this.showUsername = true
-          this.$toasted.success(this.$t('setting.name.change-success'))
+          this.$toasted.success(this.$t('settings.name.change-success'))
         })
         .catch((error) => {
           this.$toasted.error(error.message)
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_Language.vue b/frontend/src/views/Pages/UserProfile/UserCard_Language.vue
index 0d5872179..8d05620c9 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_Language.vue
+++ b/frontend/src/views/Pages/UserProfile/UserCard_Language.vue
@@ -4,7 +4,7 @@
       <b-row class="mb-4 text-right">
         <b-col class="text-right">
           <a @click="showLanguage ? (showLanguage = !showLanguage) : cancelEdit()">
-            <span class="pointer mr-3">{{ $t('setting.language.changeLanguage') }}</span>
+            <span class="pointer mr-3">{{ $t('settings.language.changeLanguage') }}</span>
             <b-icon v-if="showLanguage" class="pointer ml-3" icon="pencil"></b-icon>
             <b-icon v-else icon="x-circle" class="pointer ml-3" variant="danger"></b-icon>
           </a>
@@ -97,7 +97,7 @@ export default {
           this.$i18n.locale = this.language
           localeChanged(this.language)
           this.cancelEdit()
-          this.$toasted.success(this.$t('setting.language.success'))
+          this.$toasted.success(this.$t('settings.language.success'))
         })
         .catch((error) => {
           this.language = this.$store.state.language
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_Newsletter.spec.js b/frontend/src/views/Pages/UserProfile/UserCard_Newsletter.spec.js
index 8f15a855b..3a70840e1 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_Newsletter.spec.js
+++ b/frontend/src/views/Pages/UserProfile/UserCard_Newsletter.spec.js
@@ -74,7 +74,7 @@ describe('UserCard_Newsletter', () => {
       })
 
       it('toasts a success message', () => {
-        expect(toastSuccessMock).toBeCalledWith('setting.newsletter.newsletterFalse')
+        expect(toastSuccessMock).toBeCalledWith('settings.newsletter.newsletterFalse')
       })
     })
 
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_Newsletter.vue b/frontend/src/views/Pages/UserProfile/UserCard_Newsletter.vue
index 7b0f124f4..31fd745b2 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_Newsletter.vue
+++ b/frontend/src/views/Pages/UserProfile/UserCard_Newsletter.vue
@@ -4,7 +4,7 @@
       <b-row class="mb-3">
         <b-col class="mb-2 col-12">
           <small>
-            <b>{{ $t('setting.newsletter.newsletter') }}</b>
+            <b>{{ $t('settings.newsletter.newsletter') }}</b>
           </small>
         </b-col>
         <b-col class="col-12">
@@ -17,8 +17,8 @@
           >
             {{
               newsletterState
-                ? $t('setting.newsletter.newsletterTrue')
-                : $t('setting.newsletter.newsletterFalse')
+                ? $t('settings.newsletter.newsletterTrue')
+                : $t('settings.newsletter.newsletterFalse')
             }}
           </b-form-checkbox>
         </b-col>
@@ -50,8 +50,8 @@ export default {
           this.$store.commit('newsletterState', this.newsletterState)
           this.$toasted.success(
             this.newsletterState
-              ? this.$t('setting.newsletter.newsletterTrue')
-              : this.$t('setting.newsletter.newsletterFalse'),
+              ? this.$t('settings.newsletter.newsletterTrue')
+              : this.$t('settings.newsletter.newsletterFalse'),
           )
         })
         .catch((error) => {