add strings for translation

- File transfer status labels
- A few other missing strings that were forgotten

Change-Id: I036b4110a0d9c1ae10a18e1fb16bbd84118d647d
Reviewed-by: Olivier Soldano <olivier.soldano@savoirfairelinux.com>
diff --git a/src/MessagesVC.mm b/src/MessagesVC.mm
index b771330..73eb2c3 100644
--- a/src/MessagesVC.mm
+++ b/src/MessagesVC.mm
@@ -168,13 +168,13 @@
     // Then status label is updated if needed
     switch (status) {
         case lrc::api::interaction::Status::TRANSFER_FINISHED:
-            [result.statusLabel setStringValue:@"Success"];
+            [result.statusLabel setStringValue:NSLocalizedString(@"Success", @"File transfer successful label")];
             break;
         case lrc::api::interaction::Status::TRANSFER_CANCELED:
-            [result.statusLabel setStringValue:@"Canceled"];
+            [result.statusLabel setStringValue:NSLocalizedString(@"Canceled", @"File transfer canceled label")];
             break;
         case lrc::api::interaction::Status::TRANSFER_ERROR:
-            [result.statusLabel setStringValue:@"Failed"];
+            [result.statusLabel setStringValue:NSLocalizedString(@"Failed", @"File transfer failed label")];
     }
     return result;
 }