Translate messages from websockets

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

draw/static/draw.js

@@ -515,7 +515,12 @@ document.addEventListener('DOMContentLoaded', () => {
             console.error('Chat socket closed unexpectedly')
         })
 
-        socket.addEventListener('open', e => {})
+        socket.addEventListener('open', e => {
+            socket.send(JSON.stringify({
+                'type': 'set_language',
+                'language': document.getElementsByName('language')[0].value,
+            }))
+        })
 
         let format_form = document.getElementById('format-form-' + tournament.id)
         if (format_form !== null) {