Trello #367 Discourse theme - align with upstream tag v0.9.9.10 + create mobile theme: update post_menu_view.js and prepare for ES6
Trello #367 Discourse theme - align with upstream tag v0.9.9.10 + create mobile theme: rename post_menu_view.js --> post_menu.js (as upstream es6 file dropped the 'view' part of the name)