Add locale property to the user model

adds the locale property to the user model, which appears not to be
specified for bots

src/Discord.Net.Core/Entities/Users/IUser.cs

@@ -134,5 +134,12 @@ namespace Discord
         ///     The type of Nitro subscription the user subscribes to, or null if this value could not be determined.
         /// </returns>
         PremiumType? PremiumType { get; }
+        /// <summary>
+        ///     The user's chosen language option.
+        /// </summary>
+        /// <returns>
+        ///     The value of the user's chosen language option, if provided.
+        /// </returns>
+        string Locale { get; }
     }
 }

src/Discord.Net.Rest/API/Common/User.cs

@@ -27,5 +27,7 @@ namespace Discord.API
         public Optional<int> Flags { get; set; }
         [JsonProperty("premium_type")]
         public Optional<PremiumType> PremiumType { get; set; }
+        [JsonProperty("locale")]
+        public Optional<string> Locale { get; set; }
     }
 }

src/Discord.Net.Rest/Entities/Users/RestUser.cs

@@ -36,6 +36,8 @@ namespace Discord.Rest
         public int Flags { get; private set; }
         /// <inheritdoc />
         public PremiumType? PremiumType { get; private set; }
+        /// <inheritdoc />
+        public string Locale { get; private set; }
 
         internal RestUser(BaseDiscordClient discord, ulong id)
             : base(discord, id)
@@ -67,6 +69,8 @@ namespace Discord.Rest
                 Flags = model.Flags.Value;
             if (model.PremiumType.IsSpecified)
                 PremiumType = model.PremiumType.Value;
+            if (model.Locale.IsSpecified)
+                Locale = model.Locale.Value;
         }
 
         /// <inheritdoc />

src/Discord.Net.WebSocket/Entities/Users/SocketUser.cs

@@ -42,6 +42,8 @@ namespace Discord.WebSocket
         public int Flags { get; internal set; }
         /// <inheritdoc />
         public PremiumType? PremiumType { get; internal set; }
+        /// <inheritdoc />
+        public string Locale { get; internal set; }
         /// <summary>
         ///     Gets mutual guilds shared with this user.
         /// </summary>
@@ -89,6 +91,11 @@ namespace Discord.WebSocket
                 PremiumType = model.PremiumType.Value;
                 hasChanges = true;
             }
+            if (model.Locale.IsSpecified && model.Locale.Value != Locale)
+            {
+                Locale = model.Locale.Value;
+                hasChanges = true;
+            }
             return hasChanges;
         }