I18n: Add new translation zh_HK (100%).

170 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
Fix ordering of items in dialog.
Add tweak setting to toggle roll up feature (bug #10563).
Disable roll up feature by default (bug #10563).

Probably a confusing feature for new users, the previous commit
made it easy to enable this again.
Updates for release.
Post release tag bump.
I18n: Update translation bg (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation ja (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation kk (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation es (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation it (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation uk (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation nl (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation pt_BR (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation ko (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation en_AU (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation de (86%).

148 translated messages, 23 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation th (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation zh_CN (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation sr (100%).

171 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).