[Release] Perspectives Client 4.6.1

[Dave Schaefer]

I am happy to announce that Perspectives Client 4.6.1 has been released!

This release adds a Russian translation. All credit and thanks goes to
Alexey V. Thanks Alexey!

The update has been submitted to the Mozilla Addons site. You can also
download it directly via this link:
https://addons.mozilla.org/firefox/downloads/file/319286/perspectives-4.6.1-sm+fx.xpi

Note that this release does *not* fix the issues we had getting
Perspectives through the AMO review process. I will be tackling those
soon in a separate release, but wanted to publish this to add the
Russian translation right away.

If you have questions or comments feel free to ask!



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Full release notes:

* Add (ru) Russian translation! Many thanks to Alexey V!
* Fill in CHANGELOG history from versions before 4.3
+ Update checkloc library to v2.1. Many new tests including checking
string substitutions inside .properties files
* Fix incorrect string substitution in zh-CN localization (caught by
the new checkloc test)
* Move all external libraries to a clear 'extlib' folder; denote licenses
* Remove unused preference 'perspectives.svg'
+ Add Perspectives logo image to help page
* Convert translation file to markdown format
+ Unlock the 'About' dialog
* Fix some test data, fix tests, add new tests for client policy code
* Add a way to distinguish test setup from the tests themselves
* Add sanity check for inconsistency function so max_timespan cannot
be larger than check length
+ Add link to translation instructions from About dialog
* Add Preferences GUI input validation to 'min' and 'max' quorum threshold