I downloaded 3.0.2 version of CMS and 1.0 of the translatetable component and tried also the last code from git.
Configured default language and alternate languages. When into the backend I select the language and presso Go key, I obtain the same error:
"The action 'LangForm' does not exist in class CMSPagesController"
I've a big multilingual project, and this CMS is completely useless for me... :-(
just in case someone is searching for the "The action 'LangForm' does not exist in class CMSPagesController" message and shows up here:
Please make sure you rename the module folder to "translatable". At least with SS 3.0.5 and Translatable 1.0 that was the problem. see: https://github.com/silverstripe/silverstripe-translatable/issues/72