CPU: Add low-power PPTC load mode.

* Specifically, this setting causes the translation load core count to get reduced by two-thirds, for lower-power but still fast loading, and for unstable CPUs.

I18n: Move low-power PPTC strings into translation files & add german version.

src/Ryujinx.Input.SDL2/SDL2Keyboard.cs

@@ -12,16 +12,9 @@ namespace Ryujinx.Input.SDL2
 {
     class SDL2Keyboard : IKeyboard
     {
-        private class ButtonMappingEntry
+        private readonly record struct ButtonMappingEntry(GamepadButtonInputId To, Key From)
         {
-            public readonly GamepadButtonInputId To;
-            public readonly Key From;
-
-            public ButtonMappingEntry(GamepadButtonInputId to, Key from)
-            {
-                To = to;
-                From = from;
-            }
+            public bool IsValid => To is not GamepadButtonInputId.Unbound && From is not Key.Unbound;
         }
 
         private readonly object _userMappingLock = new();