Bug 1105857 - [Messages] User doesn't receive any notification about incoming message if native modal dialog is shown. r=schung

You can drop the localization note, since localizers will never see this file, and leave a note at the beginning of the file.
```
# These hardcoded strings do not need localization or reuse existing localizations. 
# They're put here so that they're ignored by localization processes and tools.
```