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This thread is resolved. Here is a description of the problem and solution.
Contents of WordPress widgets can be translated using the WPML plugin’s String Translation page. This is true for both default WordPress widgets and the custom ones, created by you or other authors.
WPML can translate the standard WordPress widgets, as explained here: https://wpml.org/documentation/getting-started-guide/translating-widgets/
If you have widgets that didn't register their titles for translation, you can create separate widgets per language, using the 'WPML Widgets' plugin: https://wordpress.org/plugins/wpml-widgets/