* Removed (kinda) some more $wgTitle instances
* I18n fixes -- the plain() format is more than appropriate for content action tabs and whatnot
* Fixed one strange (and likely incorrect) way of generating an URL; I'm not sure why there's the _ URL parameter, but I'm guessing it's a cache-busting method specific to wikiHow's setup. I believe it's not going to cause any harm to non-wikiHow setups, which is why I didn't remove it.

Change-Id: I2ef0c8fcfa535151ee78452611f7c379ca1729bd