of headers in private wikis.
* Language::formatTimePeriod now supports the new 'avoidhours' option to output
strings like "5 days ago" instead of "5 days 13 hours ago".
+* (T220163) Added SpecialMuteModifyFormFields hook to allow extensions
+ to add fields to Special:Mute.
=== External library changes in 1.34 ===
* The parameter $lang of the functions generateTOC and tocList in Linker and
DummyLinker must be in type Language when present. Other types are
deprecated since 1.33.
+* The static properties mw.Api.errors and mw.Api.warnings, deprecated in 1.29,
+ have been removed.
* …
=== Deprecations in 1.34 ===