Help about additional text characters for the text editor in FEBuilder for FE6

Hello, I’m a bit of a novice so I could really use some help.

I’m trying to make a full translation of FE6 to spanish, using the 1.2.1 localization patch by gringe in Serenes Forest as a base.

So far I managed to create the glyphs that I need for specific letters, and it seems they work as intended.

But when I try to use the text editor, said characters get automatically replaced back to english.

Here’s an example of what the original text is, what it roughly translates to with proper punctuation, and what it happens when I press Write to ROM:

Is there any way to correct this?