Add conversation requests list

- Add routes to REST API for conversation requests
- Add websocket notification on new conversation requests. This is unreliable.
- Rename 'ColoredCallButton' as 'ColoredRoundButton' and move it to Buttons file for reuse
- Review logic to show conversation tabs
- Add useConversationDisplayNameShort for conversations' names in lists. Will need more work.
- Add hooks to help managing React Query's cache
- Use React Query to remove conversations and update the cache doing so.
- Add ContactService and ConversationService as a way to group reusable functions for the server. This is inspired by jami-android

Known bug: The server often freezes on getContactFromUri (in ContactService) when a new conversation request is received.

Change-Id: I46a60a401f09c3941c864afcdb2625b5fcfe054a
diff --git a/client/src/locale/en/translation.json b/client/src/locale/en/translation.json
index 08602b4..8fff2ae 100644
--- a/client/src/locale/en/translation.json
+++ b/client/src/locale/en/translation.json
@@ -28,6 +28,10 @@
   "conversation_details_name": "Title",
   "conversation_details_qr_code": "QR code",
   "conversation_message": "Message",
+  "conversation_request_accepted": "You have accepted\nthe conversation request",
+  "conversation_request_ask_join": "Hello,\nWould you like to join the conversation?",
+  "conversation_request_has_sent_request": "{{contact}} has sent you a request for a conversation.",
+  "conversation_request_waiting_for_sync": "Waiting until {{contact}}\nconnects to synchronize the conversation.",
   "conversation_start_audiocall": "Start audio call",
   "conversation_start_videocall": "Start video call",
   "conversation_title_1": "{{member0}}",