Yes I'm on 2.4 but I do that (removing//commenting out the existing line) and I now see that under the spell checker drop down that german is the spell checker (which is good) but then when I click the actual spell checker button the whole browser locks up. In chrome it says the script has run too long or something like that, so I'm not too sure what to do now.
Hi, regarding SS 2.4 I'm sorry, I currently only use 2.3.7. But I can help you with these codes... they are not SS related, and it's also not TinyMCE. These are Google's Language Codes ;-) You can find them here: http://sites.google.com/site/tomihasa/google-language-codes