Remove language default value in TGApp

As it is now set by config defaults it can be removed from TGApp,
the testsuite needs to be updated to cope with the change and a
new test to check that is possible to set language from .ini files
is added

tests/test_configuration.py

@@ -160,6 +160,11 @@ def test_get_root(self):
         assert self.config.get_root_module() == None, self.config.get_root_module()
         self.config['paths']['root'] = current_root_module
 
+    def test_lang_can_be_changed_by_ini(self):
+        conf = AppConfig(minimal=True)
+        conf.init_config({'lang':'ru'}, {})
+        assert config['lang'] == 'ru'
+
     def test_create_minimal_app(self):
         class RootController(TGController):
             @expose()

tests/test_stack/baseutils.py

@@ -20,7 +20,8 @@ class FakePackage(object):
         'renderers': ['json'],
         'render_functions':{'json':tg.render.render_json},
         'use_legacy_renderers':False,
-        'use_sqlalchemy': False
+        'use_sqlalchemy': False,
+        'lang': None
 }
 
 class FakeRoutes(object):

tg/configuration/app_config.py

@@ -170,7 +170,6 @@ def __init__(self, minimal=False, root_controller=None):
         self.handle_error_page = not minimal
 
         self.use_sessions = not minimal
-
         self.i18n_enabled = not minimal
         self.serve_static = not minimal
 

tg/wsgiapp.py

@@ -1,5 +1,5 @@
-import os, sys, logging, paste
-from webob.exc import HTTPFound, HTTPNotFound
+import os, sys, logging
+from webob.exc import HTTPNotFound
 
 log = logging.getLogger(__name__)
 
@@ -61,9 +61,6 @@ def __init__(self, config=None, **kwargs):
         self.controller_classes = {}
         self.controller_instances = {}
 
-        #This is here just as a safety net as AppConfig already sets it
-        self.config.setdefault('lang', None)
-
         # Cache some options for use during requests
         self.strict_tmpl_context = self.config['tg.strict_tmpl_context']
         self.pylons_compatible = self.config.get('tg.pylons_compatible', True)