Remove LanguageComboBox.ts, see https://github.com/phetsims/joist/issues/814 and https://github.com/phetsims/chipper/issues/1302
Remove LanguageComboBox.ts, see https://github.com/phetsims/joist/issues/814 and https://github.com/phetsims/chipper/issues/1302

phetsims/joist,phetsims/joist,phetsims/joist