- all .ftl files for a language are concatenated into a single file
at build time
- all languages are included in the binary
- external ftl files placed in the ftl folder can override the
built-in definitions
- constants are automatically generated for each string key
- dropped the separate StringsGroup enum
- translation files are now stored in a separate repo, and
use a layout compatible with Pontoon
- normalize the language code in aqt, so that old config settings
and command line arguments are correctly handled
- store Qt and gettext translations in separate subfolders
- remove Crowdin scripts
