You'll go to [login to view URL] and first translate the Stable texts. Then, you'll translate the Stable readme. The dev and the stable translations are the same. So, after the stable ones are complete, you'll simply copy those over to the dev.
Familiarity with WordPress is a huge plus so that you understand the context in which strings are used. Here's a screencast on how to use my plugin.
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I'm looking for an individual that has worked with translating WordPress plugins before. I'm not currently interested in an agency.