Hi- just flagging that in some wp setups the 'check repository' does nothing, even with wp-debug on, no error messages, just nothing.
It maybe that it does not like setups where wordpress is in a sub folder - maybe look at your constants?
( or maybe look at using clean php, not so much js :) - my pet hate... )
ALSO would be really useful if one could check older versions too - as it is now if language file not updated yet, then it will not show up.
VERY useful feature that - yes one can download manually and ftp, but is great to be able to click a button !
Thanks for making the plugin available.