Rename message expiration title

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/res/layout/activity_conversation_info.xml

@@ -239,7 +239,7 @@
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:padding="@dimen/standard_padding"
-                    android:text="@string/nc_conversation_settings"
+                    android:text="@string/message_expiration_title"
                     android:textSize="@dimen/headline_text_size"
                     android:textStyle="bold" />
 

app/src/main/res/values/strings.xml

@@ -657,11 +657,10 @@ How to translate with transifex:
     <string name="send_without_notification">Send without notification</string>
     <string name="call_without_notification">Call without notification</string>
     <string name="set_avatar_from_camera">Set avatar from camera</string>
-
-    <string name="nc_conversation_settings">Conversation settings</string>
     <string name="nc_conversation_description">Conversation description</string>
 
     <!-- Expiring messages -->
+    <string name="message_expiration_title">Message expiration</string>
     <string name="nc_expire_messages">Expire chat messages</string>
     <string name="nc_expire_message_off">Off</string>
     <string name="nc_expire_message_four_weeks">4 weeks</string>