Add localisation support to overlay header title/description

osu.Game/Localisation/ChatStrings.cs

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+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Localisation;
+
+namespace osu.Game.Localisation
+{
+    public static class ChatStrings
+    {
+        private const string prefix = "osu.Game.Localisation.Chat";
+
+        /// <summary>
+        /// "chat"
+        /// </summary>
+        public static LocalisableString HeaderTitle => new TranslatableString(getKey("header_title"), "chat");
+
+        /// <summary>
+        /// "join the real-time discussion"
+        /// </summary>
+        public static LocalisableString HeaderDescription => new TranslatableString(getKey("header_description"), "join the real-time discussion");
+
+        private static string getKey(string key) => $"{prefix}:{key}";
+    }
+}

osu.Game/Localisation/NotificationsStrings.cs

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+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Localisation;
+
+namespace osu.Game.Localisation
+{
+    public static class NotificationsStrings
+    {
+        private const string prefix = "osu.Game.Localisation.Notifications";
+
+        /// <summary>
+        /// "notifications"
+        /// </summary>
+        public static LocalisableString HeaderTitle => new TranslatableString(getKey("header_title"), "notifications");
+
+        /// <summary>
+        /// "waiting for 'ya"
+        /// </summary>
+        public static LocalisableString HeaderDescription => new TranslatableString(getKey("header_description"), "waiting for 'ya");
+
+        private static string getKey(string key) => $"{prefix}:{key}";
+    }
+}

osu.Game/Localisation/NowPlayingStrings.cs

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+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Localisation;
+
+namespace osu.Game.Localisation
+{
+    public static class NowPlayingStrings
+    {
+        private const string prefix = "osu.Game.Localisation.NowPlaying";
+
+        /// <summary>
+        /// "now playing"
+        /// </summary>
+        public static LocalisableString HeaderTitle => new TranslatableString(getKey("header_title"), "now playing");
+
+        /// <summary>
+        /// "manage the currently playing track"
+        /// </summary>
+        public static LocalisableString HeaderDescription => new TranslatableString(getKey("header_description"), "manage the currently playing track");
+
+        private static string getKey(string key) => $"{prefix}:{key}";
+    }
+}

osu.Game/Localisation/SettingsStrings.cs

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+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Localisation;
+
+namespace osu.Game.Localisation
+{
+    public static class SettingsStrings
+    {
+        private const string prefix = "osu.Game.Localisation.Settings";
+
+        /// <summary>
+        /// "settings"
+        /// </summary>
+        public static LocalisableString HeaderTitle => new TranslatableString(getKey("header_title"), "settings");
+
+        /// <summary>
+        /// "change the way osu! behaves"
+        /// </summary>
+        public static LocalisableString HeaderDescription => new TranslatableString(getKey("header_description"), "change the way osu! behaves");
+
+        private static string getKey(string key) => $"{prefix}:{key}";
+    }
+}