This thread is resolved. Here is a description of the problem and solution.
How to translate a string in a tab with WPML that I can't find inside WPML String Translation
If you can't find it inside the WPML > String Translation, it might be added as admin text.
This should be the normal process to translate admin texts:
Sometimes, depending on the case, you will still have to do an extra step if after you find the string in admin texts panel and check the box and save it, it still doesn't show up in WPML > String Translation.
You might need to increase the max input vars to a big value like 50000.
For this, please try to set this variables in your php.ini:
max_input_vars = 50000; suhosin.post.max_vars = 50000; suhosin.request.max_vars = 50000;
You may need to contact your hosting provider to set them.
Please make sure you have updated the values successfully, You can verify them from WPML >> Support page.
After that, you should be able to find the field inside WPML > String Translation.
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