Tests performed:
- Print the calls to _mount_static_directory() before and after the changes.
They should print the same.
- With English as the preferred language, visit the user manual. Images should
be visible. Visit MediaWiki manual page with learn more link in MediaWiki.
Images should be visible.
- Repeat with Spanish as the preferred language.
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Veiko Aasa <veiko17@disroot.org>
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