translation update

�� Update deleted files

Extension Manager: style fixes

Extension Manager: adjust test

Since we now protect the currently used template, the test needs to be
adjusted.

Extension Manager: adjust notice strings

Because notices are shown on command line as well as in the admin GUI,
we can not use HTML in them. This adjusts the affected language strings
and removes th

Extension Manager: adjust notice strings

Because notices are shown on command line as well as in the admin GUI,
we can not use HTML in them. This adjusts the affected language strings
and removes the previously used clean up routine.

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Extension Manager: show updatemessage for installed extensions only

Extension Manager: correctly handle component types

There were a few missing and they were also missing from the detail
list. Searching for components using the type: prefix now works.

Extension Manager: check dependencies on uninstall/disable

Extensions that others depend on should not be uninstalled.

Extension Manager: protect the current template

Extension Manager: fullpath instead of realpath

This should fix backslash problems on Windows and the various additional
checks and ommissions our implementation does make more sense here
anyway.

Extension Manager: fix incorrect import

Extension Manager: (automatic) code style fixes

Extension Manager: small language adjustments

Extension Manager: updated tests

Extension Manager: adjust javascript and images

This simpliefies the view options into a single filter, which toggles
between all and updatable extensions. This should be less confusing and
is what

Extension Manager: adjust javascript and images

This simpliefies the view options into a single filter, which toggles
between all and updatable extensions. This should be less confusing and
is what most people use anyway.

Image use has been reduced and SVGs are used for icons now. Placeholders
are still PNG.

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Extension Manager: removed obsolete code

Extension Manager: added the last missing GUI tabs

Extension Manager: check repo access in handle()

Still need to check if the behaviour on missing internet works okay.

Extension Manager: Template GUI

template tab works now, fixed installed status

Extension Manager: add installer to GUI

Now the GUI uses the new Installer class. More work has been done on
the GUI itself

Extension Manager: some more work on styling

Extension Manager: by default skip all git controlled extensions

Extension Manager: overhauled list display style

The GUI is still not fully functional again.

Extension Manager: some first attempts at styling

I'm not really happy yet, but it will be improved in coming commits

Extension Manager: First go at reimplementing the GUI

still a long road ahead