Hello,

1. The string translation could not cause the issues as you mentioned.

You can add the translations in the String translation yourself.

Please go to WPML >> String Translation >> Click the scroll to the bottom of the page and click the Translate texts in the admin screens link. https://cdn.wpml.org/wp-content/uploads/2021/03/translate-texts-in-admin-screens.png

This will take you to a searchable list of admin strings. Find the Words that you want to translate and then select those words and add them to the string Translation then you will go to the WPML >> String Translation >> then find and translate them into other languages.

From there you can add the string to the string translator.

Screenshot: https://ibb.co/T4MBDPW

2. As the issue is not with the Arial font which clears that the issue is not from our theme. Sorry but we could not help you with this. Please try using other fonts.

Best Regards