Well, I did not changed the whole NEW, just 2 of the tiles:

I just modified the tiles marked with red numbers 1, 2 and 4, and changed just a little bit the M (removed two dots on the top, you see this had an effect in the M of "AMERICA". After that I just reused the tiles for
CONTINU
E and GA
ME to create
COMENZAR, ($BAE17 --> $BAE26, just to state it, hehehe).
The tile below the red 3 is the one that was giving me the glitchy, and since I did not touch it there were no mess

Also the modification of tiles marked as 1, 2 and 4 somehow affected the one marked as 6, but it does not matter since I changed that.
______________________________
UPDATE 12-May-2020: Well I know it is a bit late to announce but yesterday was released version 1.01, that includes:
%u2022 Fixed a bug that would mirror GP when dropped the amount of money in one or more digits.
%u2022 Now title screen is fully Spanish.
%u2022 "SLEEP" status is now "FRITO", the only thing so far related to sleepiness that I can come up with the tiles and space provided.
%u2022 Changed HP, MP and LV for more Spanish PV, PM and NV.
%u2022 Some lines and dialogues minor changes.
Just to make it official. And version 1.02 is in progress with few improvements and polishing, just for you people to know

__________________________
UPDATE 16-May-2020: Upcoming a redrawn of some punctuation marks:


This comes to give consistence with the style of the font, less "squary" and "bulky" than the original punctuation marks that have been changed.
Also minor change for the "?" is for the same reason, consistence.
______________
UPDATE 18-May-2020: Version 1.02 is now available.
This changes:
• Added new ending credit

• Improved the way custom tiles are displayed

(Before the "Arcana" text was more compact, but right now I cannot improve it more since the arrow would cover it when pointing "Más"; I would need to code the arrow to move a few pixels to the right when is in the middle column to improve the "Arcana" text even more)• Some lines and dialogues polishing
• Some coordinate-calibration in menus
• Fixed ALMOST completely minor bug when money is displayed in stores.
• Redrawn of punctuation marks.
KNOWN BUGS OF THIS PATCH:
♠ When selling weapons, a few pixels of the last line can be seen when back to the shop. Still better than before, though.
♠ In Chapter 2, when facing an entrance with fog, if you turn left you can see briefly that there are a repeated tile of the floor on air. In emulator, if you remove BG1 you can see is already loaded this way.

♠ I think this happens in the original ROM, but if you die in battle with Rimsala the bottom part of the screen will not display what it should anymore; just reset to fix.



I say it must happens also in original ROM since it happened at least in the unmodified copy I have of the game:

_________________________________________
UPDATE 22-May-2020:♠ In Chapter 2, when facing an entrance with fog, if you turn left you can see briefly that there are a repeated tile of the floor on air. In emulator, if you remove BG1 you can see is already loaded this way.

Bug fixed

the problem were two bytes $193b9 and $193ba, that were 63 6c instead of 20 dd... weird, when there is nothing interesting to translate over there.
Just for sharing how did I find it with my small programming knowledge: I have a save state right where the bug were; since I do almost a daily copy of my work, I just changed the name of the save state to the copy I wanted to check, from older to newest, until bug appears again. Then I created a patch using as "original file" the last version without the bug, and the "modified file" the first one with the bug. In that patch would be a small amount of changes, one of them that bug to fix, I just needed to read the patch right (as I learned thanks to this thread, btw), spot the pink elephant and fix it with original code

It has been quite interesting experiment.
Sooner than later I will upload the new fixes, but before I would like to fix the "bug shop" bug (the Rimsala's one is quite destroyer but that is out of my comprehension), and try to make the result patch to be Checksum OK.
EDIT: well, as far as I have checked... the mirror bug is also happening in the original and unmodified ROM:
UPDATE 23-05-2020:Version 1.03 is now available.
This version solves the bug in chapter 2 (that tile when turning around in front of fog doors), and polishes some lines of dialog. Nothing serious, bug still necessary.