* Handle default value for `PrefWindowSize` in code
* Add new Mac client resources to Transifex config
* Remove non-user-visible titles from XIB files
* Sync translations with code
* Sync translations with Transifex
This required some editing re. number of plural forms. Not exactly sure why
Kazakh still has one plural form there (contacted them for clarification).
Also, Manx (gv), Shan (shn), and Central Kurdish (ckb) languages aren't
supported by Transifex at the moment (contacted as well)...
Remove Belarusian (be@latin) as it was no longer present on Launchpad.
Add Welsh (cy).