Butter like Calendar scene! And a few UI tweaks.
A functional tweak to favourite button

Favourite button is used to be used only to set a notification for the corresponding session, so you couldn't be able to favourite a passed session.
But from now on, you can favourite every session even if it's passed.
Notification will be set only for the future sessions if they are favourited.
Localization strings are implemented
UI tweaks for Calendar scene
Edit button improvement and bug fix for Session scene
UI improvements in Session scene
Keyboard lag fix
AppDelegate organizing
Note taking improvements

- Notes are saved even if they are empty but there are photos taken
- Bug fix with 'Delete note' button functionality
It writes 'Photos' for the empty notes in Notes scene
Every scene has its own UINavigationController
A very bad bug is fixed in Notes scene
Added GrabberView
GrabberView will provide, of course, grabbers!

It's drawing code is written
NoteCell and FavouriteCell are now sub viewing an instance of GrabberView
Notes scene now allows selection! Yay!
AppDelegate now customizes UIToolbar too
Editing options are implemented for Notes scene
Update for photo deleting
Potential crash fix for Session scene