You do not need to be a developer to help in the improvement of Bitcoin.
Bitcoin Core 0.9.2 feature freeze is May 13th, 2014. Now is the time for native non-English speakers to join Transifex to clean up the translations in all languages. This is important for more than just Bitcoin because Litecoin will use these same translations.
What should volunteer translators do?
Try the nightly builds of Bitcoin Core as it heads toward 0.9.2. Not recommended for your production wallet.
Join Transifex as a translator and add your account to your language.
Join the Translator mailing list to receive announcements when translations are needed for Bitcoin. You will also receive notifications if other Bitcoin Project things in Transifex need translations (likely
bitcoin.org).