Add localisation support

osu.Game/Localisation/EditorSetupStrings.cs

@@ -188,6 +188,11 @@ namespace osu.Game.Localisation
         /// </summary>
         public static LocalisableString AudioTrack => new TranslatableString(getKey(@"audio_track"), @"Audio Track");
 
+        /// <summary>
+        /// "Update all difficulties"
+        /// </summary>
+        public static LocalisableString ResourcesUpdateAllDifficulties => new TranslatableString(getKey(@"resources_update_all_difficulties"), @"Update all difficulties");
+
         /// <summary>
         /// "Click to select a track"
         /// </summary>

osu.Game/Screens/Edit/Setup/ResourcesSection.cs

@@ -66,7 +66,7 @@ namespace osu.Game.Screens.Edit.Setup
                 updateAllDifficultiesButton = new RoundedButton
                 {
                     RelativeSizeAxes = Axes.X,
-                    Text = "Update all difficulties",
+                    Text = EditorSetupStrings.ResourcesUpdateAllDifficulties,
                     Action = updateAllDifficulties,
                     Enabled = { Value = false },
                 }