JP: Only randomize constant strings that are shown to the player

[theCapypara]

The JP ROM has no language strings, it uses constant strings for messages AND internal things such as debug prints and supervision_ExecuteStationSub.

Change it so that only messages printed to the player are randomized to not break internal scene loading etc.

[theCapypara]

JP text randomization is disabled for now, for more technical information about this issue, see text_script.py.