Remove line length rule for markdownlint for i18n files

What does this MR do?

Removes line length rules from markdownlint for content in the /doc-lcoale directory.

Related issues

Why was this MR needed?

As per the discussion in the related MR, we need to remove the markdownlint line length rules for translated files. The translation do not use hard wrapping, and titles sometimes get much longer in other languages, so we should not have a hard limit on any line lengths.

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What are the relevant issue numbers?

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