Tag browser: When using the Find function have unaccented characters match their accented equivalents, if the setting for it is set in Preferences->Searching
DOCX Input: When converting indices, put each sub-entry on its own line.
Edit book: Insert hyperlink: Add history for the template
Edit book: Insert hyperlink: Add a few more variables for the link template: _SOURCE_FILENAME_, _DEST_FILENAME_ and _ANCHOR_
Bug fixes
Catalogs: Set the language of created catalogs to the calibre interface language instead of English
DOCX Input: Do not display section breaks that have a numbering style applied to them.
Content server: Fix listening on :: not also listening on IPv4 interfaces on Windows
DOCX Output: Fix heading styles that have the same font size as body text getting incorrect font sizes after conversion.
EPUB/MOBI Catalogs: Fix prefix rules not working when calibre UI language is something other than English
EPUB/MOBI Catalogs: Fix exclusion by tag not working for tags that have spaces in them
Subset fonts: Fix error when trying to subset unicode characters that require two UTF-16 code points on Windows.
Content server: Fix option to restrict displayed user field not working in the /opds view
Tag browser: Fix incorrect icon for user categories.
PDF Output: Fix conversion failing when fonts with non-English names are used.
3.38.1 fixes a typo in 3.38.0 that caused the Polish books function to not work when polishing small numbers of books.