* forbid messages with too many special characters (#517).
* update moderation bot to v0.4.0.
* refactoring localization segments to reuse existing one in multiple
context.
* npm run doc:translate
To make the Weblate integration simplier, this commit merge all
translations in yml files (there is no more distinction between
standards and settings strings)
This yml files will be handled by Weblate.
TODO: document the new translation process.
