sk.po, Unify some strings (case sensitivity)
Fix compilation of ja/Math.lyx (see #9027)

The Japanese math manual was not compiling because of some
complications with foreign language switching. This would
have been fixed after the translation from English to Japanese
is done but I want to make sure the document is compilable
for 2.1.
Update layouttranslations from current po files

I only left out the following:
1) chinese translation - we have no GPL statement yet, if we don't get it the
   big update would need to be removed unfortunately.
2) I kept the dutch translation for "Chart", although this is ambigous, since
   nl.po does not contain a translation
3) I kept the danish translation for "Note", since da.po does not contain a
   translation
The review file is updated as well to contain all translations without a
documented review.
Add Mingyi Wu to contributors

Contribution was translations for Chinese (traditional).
Update chinese layouttranslations

We actually have a GPL statement, sorry for overlooking
installer: add new dictionary names

- also correct 2 file sizes
Update cs layouttranslations.
UserGuide.lyx: describe the new menu Edit→Start New Environment

- also correct some changes LFUNs
UserGuide.lyx: add missing part of description for menu Start New Environment
whitespace
Add two missing unicodesymbols
Work around broken math symbol display (bug 7954)

This extends the already existing math symbol fallback mechanism in two ways:
1) When considering the availability of the math font, also take broken
   code points into account. These are currently 0x0009 and 0x00ad, depending
   on the platform.
2) If the fallback symbol in the standard "Symbol" font is not given, or if
   the "Symbol" font is not available, or the fallback symbol is one of the
   broken ones, try to use a generic unicode symbol as second fallback instead.
   If this is available, we rely on Qt to find a font which has it. Only if
   this is not available, display the symbol as ERT.
This ensures that we do never get a symbol which is not displayed: Either
it can be displayed, with or without fallback, or it will be shown as ERT.
Remove dead code + whitespace
Add review comments for translations in beta

The LyX 2.1 beta release does already contain some new layout translations
(compared to LyX 2.0.x), which have not been reviewed yet.
* fix bug 8925: create a temporary action to avoid a menu with any action. Otherwise it will not shown on Mac OS X 10.9 with Cocoa
#6902: Enable About and similar menu items without view and create a new view if needed
Revert addition of Question and Question* environments, for the
reasons discussed at bug #9015.
installer: update the changelog
UserGuide.lyx: add another missing part of description of environment separator
Fix some shortcut conflicts (bug 9008).