Can I propose a source text for a future contest?

Yes. Especially for languages which are not spoken by site staff, translation contests depend on members of the community to propose suitable source texts in their native language. If you do not see a source text in a given language, this means that no suitable text has been proposed or decided on for the contest. Any member of the community may propose a source text for use in translation contests at http://www.proz.com/translation-contests/propose_source_text. Having proposed a source text for a contest does not exclude you from participation in that contest. If you propose a new source text for this contest which is then used in the contest, you will receive one year of full ProZ.com membership.