I understand what you say but I see in the .po pro version the line is correct but not show correct in the website.
The calendar are taking the files from the free version and pro version at the same time?
One example:
In tribe-events-calendar-pro-CA, this line:
#: ../events-calendar-pro.php:1177
msgid “Photo”
msgstr “Foto”
But in tribe-events-calendar-ca no exist this reference, because in pro file yes?