As far as the Turbine code goes, plugins should work in codemaster's version. The problem is relating to how the authors of the plugins write their plugins. If the author doesn't take extra steps to account for French and German translations then the plugins won't function properly. BuffBars, for instance, has localization code programmed in and should work with your client. KragenBars (shameless plug) also has localization code; though we are missing some translations and would happily accept assistance there
