Remove spaces and indentation from translations

[lslezak]

Problem

• Some translatable texts in Agama contain indentation spaces, like here.

Example:

{
  {
    {
      const message = _("Some very long message \
        which spans across multiple lines.");
    }
  }
}

The problem is that the indentation on the second line is actually included in the message text. The HTML collapses multiple spaces to a single space when rendered in a browser so in the end it is not a visible problem for users. But it still might be confusing for the translators.

• See related Added multiple space rule eslint-plugin-agama-i18n#7

Solution

• Enable eslint check
• Fix the reported problems

TODO

• Manually fix the translations in Weblate using sed to avoid invalidating the existing translations.

[coveralls]

coverage: 64.147%. remained the same
when pulling f1454c6 on spaces_in_translations
into 116ab0b on master.