Docs: add translation weblate link in readme

Author: Abbe98

README.md

@@ -88,6 +88,10 @@ This creates a zip file in the `target` folder, which can then be [installed in
 
 To avoid having to unzip the extension in the corresponding directory every time you want to test it, you can also use another set up: simply create a symbolic link from your extensions folder in OpenRefine to the local copy of this repository. With this setup, you do not need to run `mvn package` when making changes to the extension, but you will still to compile it with `mvn compile` if you are making changes to Java files, and restart OpenRefine if you make changes to any files.
 
+### Translating it
+
+The Commons Extension is translated using [Weblate](https://hosted.weblate.org/projects/openrefine/commonsextension/).
+
 ### Releasing it
 
 See [RELEASE.md](RELEASE.md).