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Problem:
ACF fields labels are being shown when translating my content, I don't want these labels to be trnaslatable
Solution:
I was able to fix this by adding the following line of code under your wp-config.php :

define( 'ACFML_EXCLUDE_FIELD_GROUP_STRINGS_IN_POST_JOBS', true );

You could read more about it here : https://wpml.org/documentation/support/wpml-coding-api/wpml-constants/#acfml_exclude_field_group_strings_in_post_jobs

This will exclude your ACF field's labels from the translation editor.
Relevant Documentation:
https://wpml.org/documentation/support/wpml-coding-api/wpml-constants/#acfml_exclude_field_group_strings_in_post_jobs