script.rpy, for example, there are strings which are broken in 2 due to a period or any other breaking puctuation and then the first part of the sentence is translatable while the next one is marked as deleted, adding a screenshot:
So, in the attached example I can translate
"Hi there but not the rest of the sentence, I’m getting a notification that this string was deleted.
You can try it here:
Switch to the WYSIWYG mode (The symbol with three horizontal lines at the top of the strings list).
BTW it happens with many strings, this is just one example.