Excluding qqq.json any .json file under static/i18n is now considered to
be a i18n resource. This eliminates the need to update the
i18n_resources_list.txt file every time a new language json file is
added. Thus Translatewiki PRs will not require extra work.
Introduced a new resource compiler script kiwix-compile-i18n that
processes i18n string data stored in JSON files and generates sorted C++
tables of string keys and values for all languages.