Modify/add site text associated with custom moderation flags?

Hi,

I’ve been experimenting with the new “custom moderation flags” feature and I noticed that creating a new flag leads to missing text key errors in some cases.

For example when using the moderation option “Hide post”, the message send to the user expects the existence of a text key “flag_reasons.mycustomflag”.

Is it possible to add/define the missing keys? As far as I understand, the site text feature only allows to translate already present keys.

Any guidance or hints would be greatly appreciated!