i18n: add GENDER support to "tsb-translations-user"

Spotted by Macofe
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Tsb-translations-user/es

Change-Id: Ide09206b7af8a83230a70aa080c91311b25ea775
Merge "i18n: add GENDER support to "tsb-translations-user""