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/UI/Views/Settings/SettingsCPUView.axaml

@@ -1,4 +1,4 @@
-<UserControl
+<UserControl
     x:Class="Ryujinx.Ava.UI.Views.Settings.SettingsCPUView"
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
@@ -32,6 +32,10 @@
                         <TextBlock Text="{locale:Locale SettingsTabSystemEnablePptc}"
                                    ToolTip.Tip="{locale:Locale PptcToggleTooltip}" />
                     </CheckBox>
+                    <CheckBox IsChecked="{Binding EnableLowPowerPptc}">
+                        <TextBlock Text="{locale:Locale SettingsTabSystemEnableLowPowerPptc}"
+                                   ToolTip.Tip="{locale:Locale LowPowerPptcToggleTooltip}" />
+                    </CheckBox>
                 </StackPanel>
                 <Separator Height="1" />
                 <TextBlock Classes="h1" Text="{locale:Locale SettingsTabCpuMemory}" />