syncing: add localized string

Change-Id: I415cf65b2e2aae6664aca17034d9ae29f8148619

ring-android/app/src/main/java/cx/ring/fragments/ConversationFragment.kt

@@ -1045,7 +1045,7 @@ class ConversationFragment : BaseSupportFragment<ConversationPresenter, Conversa
             unknownContactPrompt.visibility = View.GONE
             trustRequestPrompt.visibility = View.GONE
             trustRequestMessageLayout.visibility = View.VISIBLE
-            tvTrustRequestMessage.text = "Syncing conversation..."
+            tvTrustRequestMessage.text = getText(R.string.conversation_syncing)
         }
         currentBottomView = null
         requireActivity().invalidateOptionsMenu()

ring-android/app/src/main/res/values/strings.xml

@@ -247,6 +247,7 @@ along with this program; if not, write to the Free Software
     <string name="conversation_contact_is_typing">Contact is typing…</string>
     <string name="conversation_info_contact_you">You</string>
     <string name="conversation_members">Members</string>
+    <string name="conversation_syncing">Downloading conversation from peer</string>
 
     <string name="conversation_preference_color">Conversation color</string>
     <string name="conversation_preference_emoji">Conversation emoji</string>