Move dark_lang and lang_pref apps to openedx/core

lms/envs/common.py

@@ -380,6 +380,7 @@ XQUEUE_WAITTIME_BETWEEN_REQUESTS = 5  # seconds
 PROJECT_ROOT = path(__file__).abspath().dirname().dirname()  # /edx-platform/lms
 REPO_ROOT = PROJECT_ROOT.dirname()
 COMMON_ROOT = REPO_ROOT / "common"
+OPENEDX_ROOT = REPO_ROOT / "openedx"
 ENV_ROOT = REPO_ROOT.dirname()  # virtualenv dir /edx-platform is in
 COURSES_ROOT = ENV_ROOT / "data"
 
@@ -460,10 +461,13 @@ OAUTH2_PROVIDER = {
 import tempfile
 MAKO_MODULE_DIR = os.path.join(tempfile.gettempdir(), 'mako_lms')
 MAKO_TEMPLATES = {}
-MAKO_TEMPLATES['main'] = [PROJECT_ROOT / 'templates',
-                          COMMON_ROOT / 'templates',
-                          COMMON_ROOT / 'lib' / 'capa' / 'capa' / 'templates',
-                          COMMON_ROOT / 'djangoapps' / 'pipeline_mako' / 'templates']
+MAKO_TEMPLATES['main'] = [
+    PROJECT_ROOT / 'templates',
+    COMMON_ROOT / 'templates',
+    COMMON_ROOT / 'lib' / 'capa' / 'capa' / 'templates',
+    COMMON_ROOT / 'djangoapps' / 'pipeline_mako' / 'templates',
+    OPENEDX_ROOT / 'core' / 'djangoapps' / 'dark_lang' / 'templates',
+]
 
 # Django templating
 TEMPLATES = [
@@ -1131,12 +1135,12 @@ MIDDLEWARE_CLASSES = (
     'embargo.middleware.EmbargoMiddleware',
 
     # Allows us to set user preferences
-    'lang_pref.middleware.LanguagePreferenceMiddleware',
+    'openedx.core.djangoapps.lang_pref.middleware.LanguagePreferenceMiddleware',
 
     # Allows us to dark-launch particular languages.
     # Must be after LangPrefMiddleware, so ?preview-lang query params can override
     # user's language preference. ?clear-lang resets to user's language preference.
-    'dark_lang.middleware.DarkLangMiddleware',
+    'openedx.core.djangoapps.dark_lang.middleware.DarkLangMiddleware',
 
     # Detects user-requested locale from 'accept-language' header in http request.
     # Must be after DarkLangMiddleware.
@@ -2014,7 +2018,7 @@ INSTALLED_APPS = (
     'lms.djangoapps.verify_student',
 
     # Dark-launching languages
-    'dark_lang',
+    'openedx.core.djangoapps.dark_lang',
 
     # Microsite configuration
     'microsite_configuration',