Update chinese translations
* Add confirmation for clearing password
Update Searching.tid
Coding style tweak
Add support for action widgets

This is part of the groundwork for fixing #336
Add a new journal page toolbar button

Spot the easter egg with the toolbar button…

Fixes #336
Make new journal title and tags be configurable
Update "Introduction to Filters" docs
Simplify new journal button
Add "new here" button

This is a basic “new here” tiddler toolbar button that just creates a
new tiddler tagged with the title of the current tiddler.

@pmario is there anything else required?
Merge remote-tracking branch 'upstream/master'
Update chinese translations
* Add "new here" button
* Add "new journal" button
* Add default title of new tiddler
add install instruction
Revert to simple tooltip for newhere button

At present we can’t arrange for the hint to be wikified when it’s used
as the button tooltip.
Improve new here button
Merge remote-tracking branch 'upstream/master'
Revert to simple tooltip for newhere button for chinese translations
new UI texts, fixing some more typos
Make date format strings be translateable

Note for translators: I’m planning to release 5.1.3 later today.

Fixes #954
Merge remote-tracking branch 'upstream/master'
Add chinese date format strings