front-end: app.loader - remove jquery dependency & other improvements.
front-end: app.loader - remove jquery dependency & other improvements.

Signed-off-by: Adrian Pedziwiatr <92d1f01dc507822a2ea3c6bf6e5ee6ad54407d50@gmail.com>

180254/Battleship44,180254/Battleship44,180254/Battleship44,180254/Battleship44,180254/Battleship44