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This thread is resolved. Here is a description of the problem and solution.
Problem: After installing the plugin "Tools Multilingual," the language code appears before the strings. How to remove it?
This plugin should only be used in the development environment. That is, you should not install it in your production environment. To remove the language code, follow the steps below:
- Click on the Multilingual Tools > Settings. - Select the desired languages - Remove the "[%language_code%]" - Keep only the "%original_string%" on the template field - Click on the "Generate strings translations" button.
Relevant Documentation: https://wpml.org/documentation/related-projects/wpml-compatibility-test-tools-plugin/