1)
Hi - so the string that definitely works is (just in case other people have the same issue):
'[ITEM_NAME] for [USERNAME]' => '[ITEM_NAME] para [USERNAME]'
from my point of view not so easy to find out, because in my CB Subs backenend: (Paid Subscription / Settings / Display / Baskets) the displayed key is [ITEMS_ALIASES] for [USERNAME]
...but anyway: THANKS for your help
2)
Concerning the colour of the installed CB Subs language Plugins: I have checked on automatic version checking and deinstalled the old plugin (and then physically deleted the 'old' files & folders via ftp) and then re-installed the newest CB Subs language Plugin again -> it had no effect --> colour is still not green (but the plugin works fine)