3.16.0

• Bump minimum requirements PHP7.4 (#1471)
• New Javascript API (#1462)
  • See new Javascript API Wiki
  • New qTranx.config object, to replace qTranslateConfig global variable (#1462)
  • New qTranx.hooks module, to replace qTranslateX/get_qtx() global object (#1456, #1458)
  • New qTranx.ml module for multi-lingual functions like ML token parsers (#1435)
  • Use WP action hooks to replace QTX jQuery/LSB events (#1464)
  • Major refactoring for new JS API (#1469, #1458, #1457)
• Deprecations
  • Attention! Legacy JS API should be compatible in 3.16.0 but deprecated functions and events will be removed in 4.0.0.
  • See Javascript Migration Guide
  • Deprecate many legacy JS functions and jQuery events (#1462, #1469)
  • Deprecate QTX "Custom Fields" legacy format, first character as separator is broken (#1472)
  • Deprecate "Compatibility Functions" (#1461)
  • Deprecate PHP filters related to QTX "custom fields"
    • qtranslate_custom_fields
    • qtranslate_custom_field_classes
• Features
  • Generalize admin notices for deprecated settings (#1470)
  • Improve debug info collection (#1466)
• Bug fixes
  • Fix array given to qtranxf_isMultilingual (#1451)
  • Fix theme JSON config not loaded (#1463)
  • Fix call to undefined qtranxf_set_field_jquery (#1459)
  • [Slugs] Fix language autodetection (#1364)
• Localizations (l10n)
  • Update l10n POT template
  • Update l10n FR and IT with 100%
  • Update a few l10n (ES, DE, RU, CN) with minor changes for CN