Added env variable to set the default language (#2147)

app/controllers/application_controller.rb

@@ -101,7 +101,7 @@ class ApplicationController < ActionController::Base
     locale = if user && user.language != 'default'
       user.language
     else
-      http_accept_language.language_region_compatible_from(I18n.available_locales)
+      Rails.configuration.default_locale.presence || http_accept_language.language_region_compatible_from(I18n.available_locales)
     end
 
     begin

config/application.rb

@@ -131,6 +131,9 @@ module Greenlight
     # File types allowed in preupload presentation
     config.allowed_file_types = ".doc,.docx,.ppt,.pptx,.pdf,.xls,.xlsx,.txt,.rtf,.odt,.ods,.odp,.odg,.odc,.odi,.jpg,.jpeg,.png"
 
+    # Default locale
+    config.default_locale = ENV["DEFAULT_LOCALE"]
+
     # DEFAULTS
 
     # Default branding image if the user does not specify one

sample.env

@@ -201,6 +201,15 @@ MAINTENANCE_WINDOW=
 # Button can be disabled by setting the value to blank
 HELP_URL=https://docs.bigbluebutton.org/greenlight/gl-overview.html
 
+# Change the default language
+# 
+# By default, Greenlight will appear in the same language as that specific user's browser. 
+# The user can override this by going into their profile and changing the language.
+# You can override the default language to a specific language instead of the browser's language by setting
+# the variable below. To find the correct value, visit: https://github.com/bigbluebutton/greenlight/tree/v2/config/locales
+# and find the code that matches the language you want. Ex: For Arabic -> DEFAULT_LOCALE=ar, For Italian -> DEFAULT_LOCALE=it
+# DEFAULT_LOCALE=
+
 # Force a redirect to HTTPS and make cookies secure. 
 # WARNING: Only set this to false for a development environment. 
 ENABLE_SSL=true