How to test in edit mode

Hi,
It should work the same in Edit or Play mode.
If you are getting Missing Translation, it means that the Term for the current language has no translations.

You need to verify that:
- The localize component has the right Term assigned
- The Term has a valid translation (not empty) for the current language.

Also, notice that the Editor language can be different that the language you have selected to play. To be sure you have the right language, you can open the Languages Tab in the I2Languages.asset and click "Show" in English or any other language.
That will set the current language to that one, and will update all Texts to have the correct translation.

Also verify that all your translations are in the I2Languages.assets. If instead, you are using a local LanguageSource (instantiated in a scene), then the Localize component should have a reference to that source (at the bottom of the component inspector)

Hope that helps,
Frank