Merge tag '2.1.0' into develop

Use Symfony for translations so locales don't have to be installed on the OS
Removed social buttons
Various bug fixes
Fixed testing on CI
Display download options even when video only has one format
Allow every config options to be set with environment variables
Improved Spanish and French translation
New debug option

package.json

@@ -1,7 +1,7 @@
 {
   "name": "alltube",
   "description": "HTML GUI for youtube-dl",
-  "version": "2.0.5",
+  "version": "2.1.0",
   "author": "Pierre Rudloff",
   "bugs": "https://github.com/Rudloff/alltube/issues",
   "dependencies": {