fix(i18n): Fixed case of word

Reported at Transifex

Signed-off-by: rakekniven <2069590+rakekniven@users.noreply.github.com>

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

@@ -791,7 +791,7 @@ How to translate with transifex:
     <string name="nc_send_edit_message">Send Edit Message</string>
     <string name="nc_clear_edit_message">Clear Edit Message</string>
     <string name="edit_error_24_hours_old_message">Cannot Edit Messages older than 24 hours</string>
-    <string name="conversation_is_read_only">Conversation is read Only</string>
+    <string name="conversation_is_read_only">Conversation is read only</string>
     <string name="nc_edit_message_text">Edit Message Text</string>
     <string name="hint_edited_message">(edited)</string>
     <string name="nc_conversation_not_found">Conversation not found</string>