Fix some issues pointed out by IDE.

* Update .gitignore to ignore .idea.
* Removed unused local variables.
* use local context and Message class instead of deprecated wfMsg* methods.
* Remove redundant px in CSS where possible.
* Combine CSS statements where possible.
* Replace b by strong.

Change-Id: I9d5ed7b7ce585a1c101044254bcbdfc33d42afc1

.gitignore

@@ -2,3 +2,4 @@
 *~
 *.kate-swp
 .*.swp
+.idea