[Risolto] Translate a string

Background of the issue:
I can't translate the string "I'm a" in the form at the bottom of each property page, see this page as example:
link nascosto
I found it with the string translation tool under the domain "houzez" but it does not work so probably it is not that one?
I also tried using the option "Look for strings while pages are rendered" but again I can't find the right string.

Symptoms:

Questions: