Per a request from the Raspberry Pi Communications team, change
'Advanced Settings' and 'Image customization' to read 'OS
customization'.
This is to avoid amibuguity in the English, where Image_r_ and Image may
be conflated when reading at speed.
Regrettably, this breaks the existing translations. To prevent
confusion, explicitly delete the existing translations - as they're almost
certainly not valid with the reworded meaning.
This reverts commit 2fb58dc01c.
The original commit included an unexpected deletion of _all_
translations in certain languages. This was unintented, and appears to
have been a merging artefact.
This change will be re-submitted as a separate PR.
A long period of hand-editing caused these to fall out of sync with
what would have been generated from the source.
These were regnerated using the qt5_create_translation macro in the
root CMakeLists, and then using lconvert to merge the completely blank
translation files with the existing translations.
