Merge pull request #4 from Flauschbaellchen/i18n

Small corrections for german translation
Add German to the list of available translations
Fix fallback JSON
Send the Content-Language header when directly loading a translation file
Merge branch 'i18n' of github.com:M2Ys4U/KiwiIRC into i18n
Use async readdir in locales directory, reorder checking on locale files
Move translation files from assets/locales to assets/src/translations

Output from po2json remains in assets/locales
Changed locale's identifier to one-word unique ones; Updated translations