fix: relative translation path in build.py

to avoid errors when launching the demo clients

build.py

@@ -1,8 +1,11 @@
+import os
+
+
 def create_mo_files(setup_kwargs):
     from babel.messages.frontend import compile_catalog
 
     cmd = compile_catalog()
-    cmd.directory = "canaille/translations"
+    cmd.directory = os.path.join(os.path.dirname(__file__), "canaille", "translations")
     cmd.quiet = True
     cmd.statistics = True
     cmd.finalize_options()