addons/espeak_frontend.addon: add support of accute accent for ukr

Stress is commonly annotated with acute accent. Add it to the pronunciation rules, so this annotation has effect on frontend output

espeak_frontend.addon

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:107fde057d8c5dfbaa918c7acc8031ff583646865dc1a5aae04fd488798df693
-size 41854192
+oid sha256:72af743b962248f1accde7b852f24332fe83fb40d69cda48c93faa6596a19f4c
+size 41854256