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Thank you for contacting WPML Support. If the string is properly wrapped in a gettext function (see: https://codex.wordpress.org/Plugin_API/Filter_Reference/gettext), in other words it is localization ready, you can just rescan the strings of your theme files in order to have them available for translation in your String Translation settings, here is how:
1 - In your WordPress Dashboard > WPML > Theme and plugins localization > Strings in the theme settings click to check your theme where you change the files and click the 'Scan selected themes for strings' button.