diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4f887aa14..cf0b061ef 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -212,7 +212,7 @@ jobs:
           report_name: Coverage Frontend
           type: lcov
           result_path: ./coverage/lcov.info
-          min_coverage: 18
+          min_coverage: 19
           token: ${{ github.token }}
   
   #test:
diff --git a/frontend/src/apis/loginAPI.js b/frontend/src/apis/loginAPI.js
index f5b0c57f5..55e32e6dd 100644
--- a/frontend/src/apis/loginAPI.js
+++ b/frontend/src/apis/loginAPI.js
@@ -1,5 +1,7 @@
 import axios from 'axios'
 import CONFIG from '../config'
+// eslint-disable-next-line no-unused-vars
+import regeneratorRuntime from 'regenerator-runtime'
 
 // control email-text sended with email verification code
 const EMAIL_TYPE = {
@@ -86,6 +88,16 @@ const loginAPI = {
     }
     return apiPost(CONFIG.LOGIN_API_URL + 'updateUserInfos', payload)
   },
+  updateLanguage: async (sessionId, email, language) => {
+    const payload = {
+      session_id: sessionId,
+      email,
+      update: {
+        'User.language': language,
+      },
+    }
+    return apiPost(CONFIG.LOGIN_API_URL + 'updateUserInfos', payload)
+  },
 }
 
 export default loginAPI
diff --git a/frontend/src/components/LanguageSwitch.spec.js b/frontend/src/components/LanguageSwitch.spec.js
new file mode 100644
index 000000000..14dc978ac
--- /dev/null
+++ b/frontend/src/components/LanguageSwitch.spec.js
@@ -0,0 +1,95 @@
+import { mount } from '@vue/test-utils'
+import LanguageSwitch from './LanguageSwitch'
+
+const localVue = global.localVue
+
+describe('LanguageSwitch', () => {
+  let wrapper
+
+  const state = {
+    sessionId: 1234,
+    email: 'he@ho.he',
+    language: null,
+  }
+
+  const mocks = {
+    $store: {
+      state,
+      commit: jest.fn(),
+    },
+    $i18n: {
+      locale: 'en',
+    },
+  }
+
+  const Wrapper = () => {
+    return mount(LanguageSwitch, { localVue, mocks })
+  }
+
+  describe('mount', () => {
+    beforeEach(() => {
+      wrapper = Wrapper()
+    })
+
+    it('renders the component', () => {
+      expect(wrapper.find('div.language-switch').exists()).toBeTruthy()
+    })
+
+    describe('with locales en and de', () => {
+      describe('empty store', () => {
+        it('shows English as default navigator langauge', () => {
+          expect(wrapper.find('button.dropdown-toggle').text()).toBe('English - en')
+        })
+
+        describe('navigator language is "de-DE"', () => {
+          const mockNavigator = jest.fn(() => {
+            return 'de'
+          })
+
+          it('shows Deutsch as language ', async () => {
+            wrapper.vm.getNavigatorLanguage = mockNavigator
+            wrapper.vm.setCurrentLanguage()
+            await wrapper.vm.$nextTick()
+            expect(wrapper.find('button.dropdown-toggle').text()).toBe('Deutsch - de')
+          })
+        })
+
+        describe('navigator language is "es-ES" (not supported)', () => {
+          const mockNavigator = jest.fn(() => {
+            return 'es'
+          })
+
+          it('shows English as language ', async () => {
+            wrapper.vm.getNavigatorLanguage = mockNavigator
+            wrapper.vm.setCurrentLanguage()
+            await wrapper.vm.$nextTick()
+            expect(wrapper.find('button.dropdown-toggle').text()).toBe('English - en')
+          })
+        })
+      })
+
+      describe('language "de" in store', () => {
+        it('shows Deutsch as language', async () => {
+          wrapper.vm.$store.state.language = 'de'
+          wrapper.vm.setCurrentLanguage()
+          await wrapper.vm.$nextTick()
+          expect(wrapper.find('button.dropdown-toggle').text()).toBe('Deutsch - de')
+        })
+      })
+
+      describe('dropdown menu', () => {
+        it('has English and German as languages to choose', () => {
+          expect(wrapper.findAll('li')).toHaveLength(2)
+        })
+
+        it('has English as first language to choose', () => {
+          expect(wrapper.findAll('li').at(0).text()).toBe('English')
+        })
+
+        it('has German as second language to choose', () => {
+          expect(wrapper.findAll('li').at(1).text()).toBe('Deutsch')
+        })
+      })
+    })
+  })
+})
diff --git a/frontend/src/components/LanguageSwitch.vue b/frontend/src/components/LanguageSwitch.vue
index 0fad036a6..2b160b3e3 100644
--- a/frontend/src/components/LanguageSwitch.vue
+++ b/frontend/src/components/LanguageSwitch.vue
@@ -1,22 +1,72 @@
 <template>
   <div class="language-switch">
-    <b-dropdown size="sm" :text="$t('language') + ' - ' + $i18n.locale">
-      <b-dropdown-item @click.prevent="setLocale('de')">Deutsch</b-dropdown-item>
-      <b-dropdown-item @click.prevent="setLocale('en')">English</b-dropdown-item>
+    <b-dropdown size="sm" :text="currentLanguage.name + ' - ' + currentLanguage.code">
+      <b-dropdown-item
+        v-for="lang in locales"
+        @click.prevent="saveLocale(lang.code)"
+        :key="lang.code"
+      >
+        {{ lang.name }}
+      </b-dropdown-item>
     </b-dropdown>
   </div>
 </template>
 <script>
 import { localeChanged } from 'vee-validate'
+import locales from '../locales/'
+import loginAPI from '../apis/loginAPI'
 
 export default {
-  name: 'language-switch',
+  name: 'LanguageSwitch',
+  data() {
+    return {
+      locales: locales,
+      currentLanguage: {},
+    }
+  },
   methods: {
     setLocale(locale) {
       this.$i18n.locale = locale
       this.$store.commit('language', this.$i18n.locale)
+      this.currentLanguage = this.getLocaleObject(locale)
       localeChanged(locale)
     },
+    async saveLocale(locale) {
+      this.setLocale(locale)
+      if (this.$store.state.sessionId && this.$store.state.email) {
+        const result = await loginAPI.updateLanguage(
+          this.$store.state.sessionId,
+          this.$store.state.email,
+          locale,
+        )
+        if (result.success) {
+          // toast success message
+        } else {
+          // toast error message
+        }
+      }
+    },
+    getLocaleObject(code) {
+      return this.locales.find((l) => l.code === code)
+    },
+    getNavigatorLanguage() {
+      const lang = navigator.language
+      if (lang) return lang.split('-')[0]
+      return lang
+    },
+    setCurrentLanguage() {
+      let locale = this.$store.state.language || this.getNavigatorLanguage() || 'en'
+      let object = this.getLocaleObject(locale)
+      if (!object) {
+        locale = 'en'
+        object = this.getLocaleObject(locale)
+      }
+      this.setLocale(locale)
+      this.currentLanguage = object
+    },
+  },
+  created() {
+    this.setCurrentLanguage()
   },
 }
 </script>
diff --git a/frontend/src/components/SidebarPlugin/SideBar.spec.js b/frontend/src/components/SidebarPlugin/SideBar.spec.js
index 36230849f..9f9ce8a8f 100644
--- a/frontend/src/components/SidebarPlugin/SideBar.spec.js
+++ b/frontend/src/components/SidebarPlugin/SideBar.spec.js
@@ -19,6 +19,7 @@ describe('SideBar', () => {
       state: {
         email: 'test@example.org',
       },
+      commit: jest.fn(),
     },
     $i18n: {
       locale: 'en',
diff --git a/frontend/src/locales/index.js b/frontend/src/locales/index.js
new file mode 100644
index 000000000..4cb375b40
--- /dev/null
+++ b/frontend/src/locales/index.js
@@ -0,0 +1,16 @@
+const locales = [
+  {
+    name: 'English',
+    code: 'en',
+    iso: 'en-US',
+    enabled: true,
+  },
+  {
+    name: 'Deutsch',
+    code: 'de',
+    iso: 'de-DE',
+    enabled: true,
+  },
+]
+
+export default locales
diff --git a/frontend/src/store/store.js b/frontend/src/store/store.js
index aed286bc6..1d89894fb 100644
--- a/frontend/src/store/store.js
+++ b/frontend/src/store/store.js
@@ -18,7 +18,8 @@ export const mutations = {
 export const actions = {
   login: ({ dispatch, commit }, data) => {
     commit('sessionId', data.sessionId)
-    commit('email', data.email)
+    commit('email', data.user.email)
+    commit('language', data.user.language)
   },
   logout: ({ commit, state }) => {
     commit('sessionId', null)
@@ -36,7 +37,7 @@ export const store = new Vuex.Store({
   state: {
     sessionId: null,
     email: '',
-    language: 'en',
+    language: null,
     modals: false,
   },
   getters: {},
diff --git a/frontend/src/store/store.test.js b/frontend/src/store/store.test.js
index 655cca7a0..11dd5949b 100644
--- a/frontend/src/store/store.test.js
+++ b/frontend/src/store/store.test.js
@@ -35,20 +35,37 @@ describe('Vuex store', () => {
       const commit = jest.fn()
       const state = {}
 
-      it('calls two commits', () => {
-        login({ commit, state }, { sessionId: 1234, email: 'someone@there.is' })
-        expect(commit).toHaveBeenCalledTimes(2)
+      it('calls three commits', () => {
+        login(
+          { commit, state },
+          { sessionId: 1234, user: { email: 'someone@there.is', language: 'en' } },
+        )
+        expect(commit).toHaveBeenCalledTimes(3)
       })
 
       it('commits sessionId', () => {
-        login({ commit, state }, { sessionId: 1234, email: 'someone@there.is' })
+        login(
+          { commit, state },
+          { sessionId: 1234, user: { email: 'someone@there.is', language: 'en' } },
+        )
         expect(commit).toHaveBeenNthCalledWith(1, 'sessionId', 1234)
       })
 
       it('commits email', () => {
-        login({ commit, state }, { sessionId: 1234, email: 'someone@there.is' })
+        login(
+          { commit, state },
+          { sessionId: 1234, user: { email: 'someone@there.is', language: 'en' } },
+        )
         expect(commit).toHaveBeenNthCalledWith(2, 'email', 'someone@there.is')
       })
+
+      it('commits language', () => {
+        login(
+          { commit, state },
+          { sessionId: 1234, user: { email: 'someone@there.is', language: 'en' } },
+        )
+        expect(commit).toHaveBeenNthCalledWith(3, 'language', 'en')
+      })
     })
 
     describe('logout', () => {
diff --git a/frontend/src/views/Layout/DashboardLayout_gdd.spec.js b/frontend/src/views/Layout/DashboardLayout_gdd.spec.js
index 8c1e604c0..84c955042 100644
--- a/frontend/src/views/Layout/DashboardLayout_gdd.spec.js
+++ b/frontend/src/views/Layout/DashboardLayout_gdd.spec.js
@@ -44,6 +44,9 @@ describe('DashboardLayoutGdd', () => {
 
   const store = new Vuex.Store({
     state,
+    mutations: {
+      language: jest.fn(),
+    },
   })
 
   const Wrapper = () => {
diff --git a/frontend/src/views/Pages/Login.spec.js b/frontend/src/views/Pages/Login.spec.js
index c95aa5a4c..0d94840b0 100644
--- a/frontend/src/views/Pages/Login.spec.js
+++ b/frontend/src/views/Pages/Login.spec.js
@@ -1,5 +1,4 @@
 import { mount, RouterLinkStub } from '@vue/test-utils'
-import Vuex from 'vuex'
 import flushPromises from 'flush-promises'
 
 import Login from './Login'
@@ -16,20 +15,12 @@ describe('Login', () => {
     $t: jest.fn((t) => t),
   }
 
-  const state = {
-    loginfail: false,
-  }
-
-  const store = new Vuex.Store({
-    state,
-  })
-
   const stubs = {
     RouterLink: RouterLinkStub,
   }
 
   const Wrapper = () => {
-    return mount(Login, { localVue, mocks, store, stubs })
+    return mount(Login, { localVue, mocks, stubs })
   }
 
   describe('mount', () => {
diff --git a/frontend/src/views/Pages/Login.vue b/frontend/src/views/Pages/Login.vue
index c3c3b1bd0..a6d795bb1 100755
--- a/frontend/src/views/Pages/Login.vue
+++ b/frontend/src/views/Pages/Login.vue
@@ -122,7 +122,7 @@ export default {
       if (result.success) {
         this.$store.dispatch('login', {
           sessionId: result.result.data.session_id,
-          email: this.model.email,
+          user: result.result.data.user,
         })
         this.$router.push('/overview')
         loader.hide()
diff --git a/frontend/src/views/Pages/Register.spec.js b/frontend/src/views/Pages/Register.spec.js
index dcb97cf42..3d4296567 100644
--- a/frontend/src/views/Pages/Register.spec.js
+++ b/frontend/src/views/Pages/Register.spec.js
@@ -1,5 +1,4 @@
 import { mount, RouterLinkStub } from '@vue/test-utils'
-import Vuex from 'vuex'
 import flushPromises from 'flush-promises'
 
 import Register from './Register'
@@ -16,20 +15,12 @@ describe('Register', () => {
     $t: jest.fn((t) => t),
   }
 
-  const state = {
-    // loginfail: false,
-  }
-
-  const store = new Vuex.Store({
-    state,
-  })
-
   const stubs = {
     RouterLink: RouterLinkStub,
   }
 
   const Wrapper = () => {
-    return mount(Register, { localVue, mocks, store, stubs })
+    return mount(Register, { localVue, mocks, stubs })
   }
 
   describe('mount', () => {