Always use the shorthand notation if the function is a method of an object or class `{ foo() { ... } }` or `class bar { foo() { ... } }`
unless it's a callback in which case you a fat arrow function should be used `{ cb: () => { ... } }`
Commit 3729976 only updated xgettext.html which generates the .pot file.
This commit also makes sure that the actual translations are applied to
the interface.
Fixes#997
Juanjo Diaz
Samuel Mannehed