fix: parity of Base64/URL encoding between frontend and backend (#611)

Signed-off-by: Arnaud Rocher <arnaud.roche3@gmail.com>
(cherry picked from commit 5d58df8a19)

frontend/src/helpers/encoding.js

@@ -1,7 +1,7 @@
 export function base64_url_encode(input) {
   let output = btoa(input)
-  output = output.replace('+', '.')
-  output = output.replace('/', '_')
-  output = output.replace('=', '-')
+  output = output.replaceAll('+', '.')
+  output = output.replaceAll('/', '_')
+  output = output.replaceAll('=', '-')
   return output
 }