make all applications manifest.toml translatable in weblate

[Psycojoker]

Right now to translate the manifest.toml of an application you need to send a pull request to each application while editing a .toml file, it's really not optimal.

Current roadmap:

• [x] find how to use weblate API to create a new component per application on weblate
• [x] find a way to extract all strings to translate from the manifest.toml
• [x] create a new github project to store all applications translations
• [x] have a loop that parse all applications and push their translation to yunohost/apps_translations
• [x] every time a translation is pushed, create the corresponding compotent on weblate
• [x] have a loop that parse all already pushed applications and update their translation on yunohost/apps_translations (and remove unused keys from en.json)
• [x] have a script that parse this yunohost/apps_translations, extract translation and push them as a merge request (look at gitlab-ci autoblacks) on the matching app repository
• [x] on pulling translations from file, if a translation file already exist but strings from the apps aren't in it, put them in it
• [x] move manifest.toml translation in a manifest subfolder because we'll have other folders per app
• [x] push to a testing branch if it exists instead
• [x] refactor both scripts to be more DRY
• [x] use toml formatter before committing then one the toml has been modified and only push if the toml has effectively been modified
  • [x] another approach https://github.com/YunoHost/apps/blob/master/tools/packaging_v2/convert_app_to_packaging_v2.py#L328
• [x] add possibles languages by default (take the list of languages with a good translation on yunohost core)
• [ ] create a webhooks that subscribe itself to all application, each time an application is updated see if we need to update the strings to translate yunohost/apps_translations
• [ ] create another webhooks that subscribe to yunohost/apps_translations (can be the same webhook technically) and each time it's updated detect newly translated strings and push them to corresponding applications as PR

New cool steps:

• [ ] find a way to add the people who did the translation as the co author of the commit (ask the weblate api for each string? It's going to complicate things a lot but it's worth it to credit people)
• [ ] add translation status in the applications READMEs like we have on the core
• [ ] see to make DESCRIPTION.md stuff translatable
• [ ] translate config panel
• [ ] see if we can translate the "choices" (apparently not, we'll likely have to update chore and web admin for that)
• [ ] translate arbitrary anti-features
• [ ] there are probably other things that can be translatable

[OniriCorpe]

to create a new component per application

ouch 😬

[Psycojoker]

to create a new component per application

ouch 😬

We used to have just one gigantic component and it was a total mess and hard for translators to work with :/