This service allows you to build custom Language Pack for your Pebble Smartwatch.
Please be warned that original Pebble firmware doesn't (yet) support right-to-left scripts. As a result, if you install Hebrew-enabled language pack from this site, all Hebrew texts will be written in right-to-left manner.
Luckily, there is a great solution to this problem: excellent elbbeP project by cpfair. They offer a patched version of Pebble firmware for all currently available watches with RTL support built in.
They also offer language packs, but you can use language packs from this site instead. This will allow you to add interface translation, or mix hebrew with some other language.
Installation guides are available in wiki: for Android and for iOS.
Your feedback is welcome: simeon+pebware -at- maryasin.name.