Executing Localize script via script

If you have a GUIText object with a Localize component. You could change the Term and SecondaryTerm and then call OnLocalize to update the translation based on the new Terms.

The localize component does cache some of the data it uses, but not the actual Terms and translation. Given that I2 Localization can handle several object types, the RegisterTargets is called initially to detect what object is meant to be localized (i.e. if its Label or a Sprite, or a sound, etc).

You don't need to call RegisterTargets again unless you are actually destroying the GUIText component and creating a new one. But if you are only changing the term or text in the GUIText, then the cached values will be ok as only the reference to the GUIText component is cached as well as the functions that do the translation for that type of object.

So, just change the term and secondaryTerm and call OnLocalize(), that should work fine.