added language contribution to README

README.adoc

@@ -743,6 +743,11 @@ Due to these custom labels, the location filter and locale will be disabled.
 +
 . To train with multi-label data separate the class labels with commas in the folder names (e.g., `Poecile atricapillus_Black-capped Chickadee, Cardinalis cardinalis_Northern Cardinal`). This can also be combined with negative samples as described above. The validation split will be performed combination of classes, so you might want to ensure sufficient data for each combination of classes. When using multi-label data the upsampling mode will be limited to 'repeat'.
 
+== GUI Language
+
+The default language of the GUI is English, but you can change it to German in the *Settings* tab of the GUI. If you want to contribute a translation to another language you, use the files inside the `lang` folder as a template. You can then send us the translated files or create a pull request.
+To check your translation, place your file inside the `lang` folder and start the GUI, your language should now be available in the *Settings* tab. After selecting your language, you should restart the GUI to apply the changes.
+
 == Funding
 
 This project is supported by Jake Holshuh (Cornell class of `'69) and The Arthur Vining Davis Foundations.