Thank you for your interest in donating content to our projects!
The volunteer community who create and curate the bulk of the content on our projects have crafted processes for facilitating such donations. Recommended steps on the English Wikipedia can be found at Wikipedia:Donating copyrighted materials. Several other language Wikipedias have pages describing the process; you can see the list of languages in which it is available and access those by clicking "languages" in the left toolbar. Specific information on donating images and other media files can be found at Commons:Email templates. If you have any questions on donating copyrighted content not answered at those pages, you may wish to consult the web-based "help desk" on Commons or use the "Help" link in the left toolbar to locate a help forum on the project to which you wish to donate. You can also write to permission wikimedia org.
A general approach to translation from English Wikipedia to other projects is provided here. This approach is likely to succeed on most projects with most languages. If you want specific advice from other volunteers, you can reach out to the "help" or community discussion forum on the project where you want to place the translation. These are generally linked from the side of every page. If you can't find it, you can write to info wikimedia org for more information. Please, in that case, specify the language project where you want to work (for instance, Italian Wiktionary; French Wikipedia).
If you are interested in helping to translate official documents used for management of Wikimedia projects, this work is also done by volunteers. Meta's "Babylon" page is a good place to begin. There is a section there on getting started which includes some important links, and there is also a section on communication that tells you some of the best places to get in touch with other translators, who may be able to give you specifics about the work. We recommend reading the tutorial linked from the "getting started" section before beginning, if you choose to pitch in, as the system actually looks more complex than it is.