Openfire Thread Dump Plugin 1.2.1 Release

What's Changed

• fixes #19: fix unescaped apostrophe in javascript mouseover on admin console by @guusdk in #20
• Updates for file src/main/i18n/threaddump_i18n.properties in zh_CN by @transifex-integration in #21
• fixes #22: fix Openfire 5.0.0 compatibility by @guusdk in #23

Full Changelog: v1.2.0...v1.2.1