Update strings.js

update new strings
Added Localisation for the Loading... message
add missing comma
Cleaned up whitespaces and indents
Update getKeyBindings()
Fixed errors raised by KeyBindingManager unit test
Updated addBinding()
Updated _addBinding()
Add boss variable back in
Cleaned up whitespaces and indents
Added test case for command argument being a string or an object
Fix parameter documentation
Adding back whitespace
Cleaned up the handling of an existing key binding
Rollback _addBinding() changes
Add whitespace back into license
Merge pull request #2996 from antonellopasella/master

Updated italian translation
Use \u2026 escape char
Merge pull request #3020 from WebsiteDeveloper/issue-2645

Added Localisation for the Loading... message
Merge pull request #3058 from lkcampbell/fix-issue-2078

Fix issue 2078