Change headline for search user for new chat on chat page

webapp/components/Chat/AddChatRoomByUserSearch.vue

@@ -1,7 +1,7 @@
 <template>
   <div class="add-chat-room-by-user-search">
     <!-- Wolle -->
-    <h2 class="title">{{ $t('group.addUser') }}</h2>
+    <h2 class="title">{{ $t('chat.addRoomHeadline') }}</h2>
     <ds-space margin-bottom="small" />
     <ds-space>
       <select-user-search :id="id" ref="selectUserSearch" @select-user="selectUser" />

webapp/locales/de.json

@@ -78,6 +78,7 @@
     }
   },
   "chat": {
+    "addRoomHeadline": "Suche Nutzer für neuen Chat",
     "cancelSelectMessage": "Abbrechen",
     "conversationStarted": "Unterhaltung startete am:",
     "isOnline": "online",

webapp/locales/en.json

@@ -78,6 +78,7 @@
     }
   },
   "chat": {
+    "addRoomHeadline": "Search User for new Chat",
     "cancelSelectMessage": "Cancel",
     "conversationStarted": "Conversation started on:",
     "isOnline": "is online",
@@ -475,7 +476,7 @@
     "addMemberToGroupSuccess": "“{name}” was added to the group with the role “{role}”!",
     "addUser": "Add User",
     "addUserNoOptions": "No users found!",
-    "addUserPlaceholder": " Username",
+    "addUserPlaceholder": " User name",
     "allGroups": "All Groups",
     "button": {
       "tooltip": "Show groups"