WordPress plugins and other widgets are mostly used in blogging industry. Most of the plugins and widgets comes with only English language. Only some plugins comes with multi-language support. Take note on the language that is offered and if you know a language that is not in the list, propose to the developer of this plugin. This way, you might get a backlink from him for your support.
It might take some time to complete the translation process, but personally I think it is worth it. Everyone have their own way to build one way link with dofollow. Imagine of writing hundreds of comments on hundreds of dofollow blogs. Exchanging links with also passing your page rank juice with the exchanger. If you could notice, the only easy way to earn page rank juice is by doing translation services.
It is not a common way used by webmaster to get page rank or backlinks. So, if you try now, you might be a step ahead compared to other webmasters. Start translating now.