This thread is resolved. Here is a description of the problem and solution.
Problem:
You need to replace the UK flag with the US flag for English in your WPML language switcher.
Solution:
We recommend you upload the custom US flag in the WPML >> Languages >> Edit Languages section by selecting the "Custom flag" option. For detailed instructions, please refer to our documentation on how to add a custom flag.
If this solution does not apply to your case because it might be outdated or not suitable for your specific situation, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If you still need help, please open a new support ticket at WPML support forum.
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This topic is split from https://wpml.org/forums/topic/i-cant-find-anything-about-buttons-translation/