Find and replace tool

Change-Id: I311b16c5aa5cfa96ac909bbd3aeebeae2a15a2c2
Go backwards through find and replace results on shift enter

Depends on I078874a6 in OOjs-ui.

Change-Id: Ia7069c73d7ab6fd89c8bd3ffca7345144929661d
Merge "Find and replace tool"
Merge "Go backwards through find and replace results on shift enter"