add strftime notice on setup

string was already in translations, just forgot to include it.

html/setup.html

@@ -257,6 +257,7 @@
                             <label class="row switch pb-1">
                                 <input type="radio" name="email-24h" value="false"><span>{{ .lang.Email.time12h }}</span>
                             </label>
+                            <span class="support mb-1" id="dateformat-description"></span>
                         </div>
                     </div>
                     <div class="col">

ts/setup.ts

@@ -201,6 +201,7 @@ class LangSelect extends Select {
 window.lang = new lang(window.langFile as LangFile);
 html("language-description", window.lang.var("language", "description", `<a href="https://weblate.hrfee.pw">Weblate</a>`));
 html("email-description", window.lang.var("email", "description", `<a href="https://mailgun.com">Mailgun</a>`));
+html("dateformat-description", window.lang.var("email", "dateFormatNotice", `<a href="https://strftime.ninja/">strftime.ninja</a>`));
 
 const settings = {
     "jellyfin": {