Update storyboard strings, qqq files when master files change

en.lproj/Main_iPhone.strings now updates automatically when
new things appear in Main_iPhone.storyboard.

qqq.lproj/*.strings files now have stub entries added for any new
entries in en.lproj/*.strings files. These should be very visible
in code review if they don't get caught before committing. :)

Extra entries from the qqq.lproj no longer in en.lproj are also removed.

Change-Id: Ibd01ba5eb754ec9aaafddf0391496c8c527273cc
Use system language as default wiki search language

This will set the search language to the system locale lang
unless you've set an explicit setting -- previously we simply
used English as a default, whoops!

Also loads the appropriate Main Page on first view (note if
switching languages after first run, we'll show whatever was
shown previously, even if it's a main page).

Moved a few bits from SessionSingleton and WebViewController
to WikipediaAppUtils:
* domainNameForCode
* mainArticleTitleForCode
* copyAssetsFoldertoAppDataDocuments

also added:
* wikiLangForSystemLang

Currently the system->wiki langugage mappings simply throw away
any variant or country code and take the rest as-is; should
probably do a quick survey to make sure there aren't any
conflicts with any of the languages supported by iOS.

Change-Id: Iff978197949940ec53bb4c13bf5eb71f4dc0ba7f
Toc appearance updates. More subtle selection indicator.

Lead section background color remains blue.

Subsection selection indicated by vertical blue bar on
left of section.

Fix for toc incorrectly appearance animation if page
chrome had been scrolled away.

Faster toc appearance and selection scroll.

Change-Id: I6593c141122da7114517434068c58ac9c8837ef8