localization: set language for formencode based on config file

Before, the language would be taken from the environment - such as LANG. Now it
will use exactly what has been configured as lang in .ini .

The formencode initialization could be done in many places and there is no
obvious place ... but this one seems ok.

kallithea/config/environment.py

@@ -23,6 +23,7 b' import platform'
 import pylons
 import mako.lookup
 import beaker
+import formencode
 
 # don't remove this import it does magic for celery
 from kallithea.lib import celerypylons
@@ -138,4 +139,5 b' def load_environment(global_conf, app_co'
     if str2bool(config.get('initial_repo_scan', True)):
         repo2db_mapper(ScmModel().repo_scan(repos_path),
                        remove_obsolete=False, install_git_hooks=False)
+    formencode.api.set_stdtranslation(languages=[config.get('lang')])
     return config