Highlight savewiki text as well as icon
Merge pull request #713 from BramChen/master

Update chinese translations
Correct description of home button
Add descriptions to toolbar buttons
Updated translation instructions
Add language toolbar button

Also adds flag icon for each language.

One limitation is that the language button doesn’t work properly when
accessed via the “more” menu of the page controls.

@BramChen - could you help me choose the most appropriate flags to use
for the variants of Chinese?
Fix problem with parsing missing tiddlers