Add GetMessageByLanguage method to lang library

Author: IIIaKa

src/Libraries/Lang.cs

@@ -125,7 +125,7 @@ public string[] GetLanguages(Plugin plugin = null)
         }
 
         /// <summary>
-        /// Gets a message for a plugin in the required language
+        /// Gets a message for a plugin in the players set language
         /// </summary>
         /// <param name="key"></param>
         /// <param name="plugin"></param>
@@ -142,6 +142,24 @@ public string GetMessage(string key, Plugin plugin, string userId = null)
             return GetMessageKey(key, plugin, GetLanguage(userId));
         }
 
+        /// <summary>
+        /// Gets a message for a plugin in the specified language
+        /// </summary>
+        /// <param name="key"></param>
+        /// <param name="plugin"></param>
+        /// <param name="lang"></param>
+        /// <returns></returns>
+        [LibraryFunction("GetMessageByLanguage")]
+        public string GetMessageByLanguage(string key, Plugin plugin, string lang = defaultLang)
+        {
+            if (string.IsNullOrEmpty(key) || plugin == null)
+            {
+                return key;
+            }
+
+            return GetMessageKey(key, plugin, lang);
+        }
+
         /// <summary>
         /// Gets all messages for a plugin in a language
         /// </summary>