I have translated howto.txt and some other documents in my mother tongue. Who shall ask to put it online?

You should put translated documents directly onto this wiki. The wiki supports any language.

For cases when an article name would conflict with an existing article, you can prefix the name with the two-letter language code. For example, if you wanted to post a Brazilian Portugese translation of [[HOWTO]], you would name the page [[br/HOWTO]]