Do not use Cockpit manifest for storing supported languages

[lslezak]

Problem

• Continue with dropping the Cockpit dependency

Solution

• Do not use the Cockpit manifest for storing the list of supported languages
• Use a separate languages.json file instead of the manifest.json
• Import the JSON file directly into the JS code
• The workflow is not changed, the update script just generates a different file
• The change is backward compatible, works with both Cockpit and the new server

Testing

• Updated unit tests
• Tested manually, the language selection still works fine

[coveralls]

coverage: 74.333% (-0.01%) from 74.344%
when pulling 6b56072 on drop_locale_manifest
into f143990 on master.

[jreidinger]

maybe add it also to .gitignore?

[lslezak]

Um, the file is normally part of the Git tree. Because it contains the language names in the respective language (not in English) so the English spell checker should be skipped.

In theory you could update the index manually in some special cases.

In general I do not like git-ignoring normal files which are part of the git tree, that's strange.

[dgdavid]

In general it looks good. I guess it deserves an entry in the changes file too.

[dgdavid]

👍

[jreidinger]

👍 for writting errors to stderr