EventEarlyNotification timestamp bugfix and other changes (#84)

This PR fixes EventEarlyNotification timestamp not displaying correctly
and also has some other changes:
- Add xmldocs for `/settingslist`'s `page` option in
SettingsCommandGroup.cs
- Add option description for `index` for `/delreminder`
- Some corrections of grammatical errors in Messages.tt-ru.resx
- Fix `ArgumentOutOfRangeException` in `/settingslist` that appears if
the user uses a negative integer in `page`

---------

Signed-off-by: Macintosh II <95250141+mctaylors@users.noreply.github.com>
Co-authored-by: Octol1ttle <l1ttleofficial@outlook.com>

src/Commands/RemindCommandGroup.cs

@@ -153,7 +153,9 @@ public class RemindCommandGroup : CommandGroup
     [RequireContext(ChannelContext.Guild)]
     [UsedImplicitly]
     public async Task<Result> ExecuteDeleteReminderAsync(
-        [MinValue(0)] int index)
+        [Description("Index of reminder to delete")]
+        [MinValue(0)]
+        int index)
     {
         if (!_context.TryGetContextIDs(out var guildId, out _, out var userId))
         {