Remove mctaylors' version of the Russian language (#297)

295 PR/issues ~(not 300, however)~ or ~1.5 years ago, I made #2, the
Russian language replacement aka mctaylors-ru. This was my first
contribution to the Octobot project (formerly known as Boyfriend). This
was to add some sort of unique, unusual feature to Octobot, which
doesn't have any moderator bots. Everyone loved the language. But it
just became difficult to maintain. I certainly don't want to get rid of
it, but it leaves me no other choice. This isn't a joke or anything like
that. I'm tired of maintaining it. And I'm sure the other contributors
are too.

This PR removes the mctaylors-ru language.

---------

Signed-off-by: mctaylors <cantsendmails@mctaylors.ru>
Co-authored-by: Octol1ttle <l1ttleofficial@outlook.com>

src/Data/Options/LanguageOption.cs

@@ -11,8 +11,7 @@ public sealed class LanguageOption : Option<CultureInfo>
     private static readonly Dictionary<string, CultureInfo> CultureInfoCache = new()
     {
         { "en", new CultureInfo("en-US") },
-        { "ru", new CultureInfo("ru-RU") },
-        { "mctaylors-ru", new CultureInfo("tt-RU") }
+        { "ru", new CultureInfo("ru-RU") }
     };
 
     public LanguageOption(string name, string defaultValue) : base(name, CultureInfoCache[defaultValue]) { }