Bug 1027995 - [followup] Fix localization

You probably want an empty line here after the string.

Also, please add a localization comment.
```
# LOCALIZATION NOTE (ringtoneSectionBrandName): this name is used in
# apps/ringtones to create an header (e.g. "Firefox Ringtones", or "Firefox
# Alerts"). Don't reuse in different contexts.
```