Just some bugs I noticed in the error log while fixing another mod.

You have a duplicate localization file newsfeed_suppress_replace_l_english.yml, you only need the one in localization/replace and it should be in localization/replace/english not in localization/english/replace

Your customizable_location fallback loc should be loc keys not localization string, it's clear in the error log, I fixed it by simply creating localization strings and replacing the strings in the CL files with the loc keys

There is missing Korean localization, again clear in the error log

You should replace the unlocalized text 'Header Text' in newsfeed_settings.gui with a raw_text, again this is in the error log.