Accessibility: Allow setting default document language for .docx export

[Ovgodd]

Is your feature request related to a problem? Please describe.
Hello guys ! when exporting a .docx file using @blocknote/xl-docx-exporter, the default language of the document is always set to en-NL.
This causes accessibility issues: screen readers rely on this metadata (<w:themeFontLang w:val="..."/> in settings.xml) to pronounce words correctly based on the language.

Describe the solution you'd like
We’d like to have a way to configure the default language of the generated .docx file, similarly to how the language prop is injected in the PDF exporter (via @react-pdf/renderer).
Ideally, this could be a lang or language field passed in the export options.

Describe alternatives you've considered
Trying to override the default language using default styles.run.lang, but the lang attribute doesn’t influence the main document language or settings.

Additional context
Here is the XML tag in settings.xml that currently defines the default language:

<w:themeFontLang w:val="en-NL"/>
in /packages/xl-docx-exporter/src/docs/template

Bonus
[ ] I'm a sponsor and would appreciate if you could look into this sooner than later 💖

[nperez0111]

Hi @Ovgodd good catch, I'd be happy to have a PR that changes this.

This is where the externalStyles are defined (which should be exposed as document options and therefore replaceable on your side:

BlockNote/packages/xl-docx-exporter/src/docx/docxExporter.ts

Line 191 in 9b6f462

const externalStyles = (await import("./template/word/styles.xml?raw"))

I'd be happy to take a PR which:

• Adds a new document option: locale which is whatever OOXML defines as the valid set of locales
• Replaces the locale string to whatever value is provided. I think we should likely default to en-US instead honestly

I look forward to having this fixed!

[Ovgodd]

@nperez0111 Hey !

I agree a PR for this will be nice ! and the default can be en-US instead of NL yes !