The Realms menu has a foreign language when using the "Australian English" language setting.
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This is a Crowdin issue, and therefore this bug is invalid. If you want this to be fixed, go to https://crowdin.com/translate/minecraft/9381/enus-enau and add/vote for the correct translation.

Someone accidentally translated a lot ot Vietnamse strings to Australian English.
Deleted the translations, but it will take some time until the new translations are integrated in Minecraft.