I like the per-site caching offered by Django (it's simple) and I like the cache to be dependent on the chosen language. Unfortunately with the current `CacheMiddleware` you can either have the one or the other but not both at the same time.
`VaryOnLangCacheMiddleware` is a small wrapper around `CacheMiddleware`. It looks at the `request.LANGUAGE_CODE` (set by `LocaleMiddleware`) and appends it to your `CACHE_MIDDLEWARE_KEY_PREFIX`. So "mysiteprefix" becomes "mysiteprefix_en" or "mysiteprefix_de-AT" depending on the user's chosen language. Site-wide, so no messing with per-view decorators and stuff.
To use this, make sure `VaryOnLangCacheMiddleware` comes below `LocaleMiddleware` in your settings.py. If you haven't set your `CACHE_MIDDLEWARE_KEY_PREFIX`, it's works, too.
**Update:** Replaced `super()` calls with `CacheMiddleware.xxx(self, ...)`.
                
                    
                    
                    - middleware
 
                    
                    - i18n
 
                    
                    - cache
 
                    
                    - language