Backport pseudolocalization to 3.x

[angad-k]

(cherry picked from commit e79dde1)

Backport of pseudolocalization to 3.x. See #49361

[Calinou]

I tested this pull request. It works well in the editor, but some consonants are missing in the running project I tested.

Also, this is unrelated to the backport, but shouldn't the default pseudolocalization prefixes and suffixes be changed to [!!! and !!!] to match the editor's pseudolocalization debug feature?

Editor

Game's main menu

Game's options menu

Game's first level

[bruvzg]

fake_bidi can be removed, 3.x do not have any BiDi support, so it won't do anything.

[angad-k]

I tested this pull request. It works well in the editor, but some consonants are missing in the running project I tested.

@Calinou I think the font doesn't support the extra glyphs. This is the output on Noto Sans.

Also, this is unrelated to the backport, but shouldn't the default pseudolocalization prefixes and suffixes be changed to [!!! and !!!] to match the editor's pseudolocalization debug feature?

Yup. I'll make that change.

[akien-mga]

I tested this pull request. It works well in the editor, but some consonants are missing in the running project I tested.

I think the font doesn't support the extra glyphs. This is the output on Noto Sans.

Note that in master, missing glyphs should properly be identified as such. But indeed in 3.x they're simply invisible. That's not a priority to fix unless someone is really interested, since it's fixed in 4.0 already.

[bruvzg]

I think the font doesn't support the extra glyphs. This is the output on Noto Sans.

3.x might also fail to compose these characters, in case font only have separate base glyph and combining diacritic glyph.