Override screen prompts

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One workaround I tried was to put the alternate copy in a different locale, but for some reason I’m not able to override that either. Here’s what I tried:

{% if application.id == "5eUDioEdw0CP7B3ETunA6dVe2jST8inD" %}
    <html lang="et">
{% else %}
    <html lang="en">
{% endif %}

The login screen renders <html lang="et"> but the copy is in English.