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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much better greek (el) translations

translation update

translation update

translation update

translation update

translation update