Fix bogus localization entries in Xcode project

pt-BR and pt_PT were left in the list by some merging accident(?).
Remove them as they only duplicated the reali lprojs (pt_BR and pt
respectively).
Move OS X translations to locales/osx/

Keep the macosx/ directory for system files, scripts etc.
Fix Makefile.am broken by PO files renaming
Update locales/Makefile.am when updating from Crowdin
Improve Preferences layout for German et all.

Instead of requiring at least 210px for the font pickers, have a minimum
size for the whole window and allow smaller pickers. This still looks
the same in English, but doesn't make the window too wide with "longer"
languages such as German.
Fix various FindMenu() uses

Always use the same string (with accel) as used in the menu; this now
works with wx-3.0 and prevents failures in case of inconsistent
translations.
Use EVT_UPDATE_UI for toolbar-related updates

Instead of explicitly enabling/disabling items shown in toolbar, use
EVT_UPDATE_UI. This is not full conversion yet, only commands shown in
the toolbar are affected. Ideally, all menu commands should do the same.
Move toolbar logic into an abstract class

Separate the toolbar-handling logic from its actual implementation, to
allow plugging in different (native) implementations.
Make "Untranslated entries first" off by default

The setting keeps confusing new users, because the entries are moved
around when you save a file. Ideally, they'd be left in the original
order until the next time the file is opened (or, alternatively,
reordered immediately), but these would be more complicated to implement.

So just change the default to be the unsurprising value instead. The
original behavior is still one click away in the View menu.
Translate Ctrl+ and Alt+ accels in code

Some languages (notably, German) don't use "Ctrl", but translate it.
Make sure the correct form is used in programatically generated menu
items (sidebar, bookmarks, suggestions).
Fix annoying flicker in sidebar tooltips

Setting them on too many controls leads to jarred, weird behavior: they
skip around randomly, as the underlying control changes. Keep them on
just the text and the icon.
Update translations from Crowdin
Avoid non-essential output when compiling POs in Xcode
OS X: Use small window variant for extractors list
Update list of default extractors

Sync the list with the capabilities of modern xgettext (0.19). In
particular, add Lua and JavaScript, but also a bunch of other languages.
Update WinSparkle
OS X: Don't remember size of fullscreen windows

See #119.