DONE
1. Simple translation fixes
2. Signal item_modified is sent also on destroy rev and destroy all and sends some important data (content, meta).
3. Creating a receiver function for signal item_modified. Since the new file for sending notifications has no connection with the rest of the project, blinker can't find the receiver function. Temporal workaround is importing the function in one of the modules that is loaded at start-up.
4. Created Notification class and started with 2 methods: one for determining destroy type, another for determining change type.
TODO
1. Finish with the methods for Nofication class
2. Finish and commit mail HTML templates