Merge pull request #672 from qgis-jp/make_pull_req_from_ja

update Translation GUI ja
[Plugin Manager] If no Python support detected, display an explanation why there is nothing to install. Fixes #8063. PL translation included.
- add missing sip bindings
- port widgets_tree.py to QtXml and update customization.xml (fixes #5752 and  #8054)
missed query builder help in c6a4bb86aa
DBManager: more SIP API update (fix #8132)
fix build error
update extent on delete feature and updategeometry
[memory provider] Don't crash on updateExtent and feature without geometry
sip update
spelling fixes
german translation update
use QgsNetworkManager in plugin installer (fixes #8137)
fix build error
[fTools] fixes zoom to error in check geometry validity tool
fix sip build errors
KeyboardControlHandler: remove unused parameter
Russian translation update.
more interface fixes (missing GUI_EXPORT and sip)
Merge pull request #675 from artfwo/master

Russian translation update (half-way)
Fixing some Tooltips regarding to #8147