Add method for easier translations with poedit

[onnimonni]

It would be really nice if poedit could automatically find the translatable strings from dust templates.

@Nomafin has created clever hack with php/regex which creates new .php file which includes them for poedit. This way poedit will find the translatable strings: https://github.com/devgeniem/dustpress/wiki/Translation-parser

We could implement something like this https://www.npmjs.com/package/xgettext-dust to check the strings with poedit straight from .dust templates.