I just want to change the text "Add Media" to another English text. I search the text under my theme but it didn't appear.
But under Loco Translate > WordPress, there're so many translation files. Which should I edit?
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There are only four files in the default text domain. I found "Add Media" in the first one. (Development).
I don't recommend generating your own template. This is an advanced tool for authors. Use one of the Korean files as a template instead. You know they'll hold the correct source strings as long as your WordPress is up to date.
Click Copy under the Korean file > Select English > Select "Just copy English source strings" under template options.