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

lib/jquery.uls/css/jquery.uls.lcd.css

@@ -13,8 +13,7 @@
 }
 
 .uls-language-block ul {
-	margin: 0px;
-	margin-bottom: 1.6em;
+	margin: 0px 0px 1.6em;
 }
 .uls-language-list ul li {
 	font-weight: normal;