Fix base64 encoded prefix received on the server side for chinese characters (#1126)

Signed-off-by: Daniel Valdivia <18384552+dvaldivia@users.noreply.github.com>

restapi/utils.go

@@ -136,3 +136,8 @@ func ExpireSessionCookie() http.Cookie {
 		SameSite: http.SameSiteLaxMode,
 	}
 }
+
+// SanitizeEncodedPrefix replaces spaces for + since those are lost when you do GET parameters
+func SanitizeEncodedPrefix(rawPrefix string) string {
+	return strings.Replace(rawPrefix, " ", "+", -1)
+}