[GNC] How to use input method in GnuCash installed from Flatpak ?

[Long]

Dear GnuCash,
i'm vietnamese and tried to use Ibus method to type in your software
installed from Flatpak. Because i really don't know how to install your
software from source, read some wiki doesn't help me, maybe easiest guide
will helpful.
For now, the "ONLY" way is write down my things and copy it into your app,
my god.



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