KernelModuleDisabler: allow disabling the kernel module backend

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/res/values/strings.xml

@@ -103,6 +103,11 @@
     <string name="module_installer_title">Download and install kernel module</string>
     <string name="module_installer_working">Downloading and installing…</string>
     <string name="module_installer_error">Something went wrong. Please try again</string>
+    <string name="module_disabler_disabled_title">Enable kernel module backend</string>
+    <string name="module_disabler_disabled_summary">The experimental kernel module can improve performance</string>
+    <string name="module_disabler_enabled_title">Disable kernel module backend</string>
+    <string name="module_disabler_enabled_summary">The slower userspace backend may improve stability</string>
+    <string name="module_disabler_working">The application will restart in 5 seconds</string>
     <string name="mtu">MTU</string>
     <string name="multiple_tunnels_title">Allow multiple simultaneous tunnels</string>
     <string name="multiple_tunnels_summary_on">Multiple tunnels may be turned on simultaneously</string>

ui/src/main/res/xml/preferences.xml

@@ -23,4 +23,5 @@
         android:summaryOff="@string/dark_theme_summary_off"
         android:summaryOn="@string/dark_theme_summary_on"
         android:title="@string/dark_theme_title" />
+    <com.wireguard.android.preference.KernelModuleDisablerPreference android:key="kernel_module_disabler" />
 </androidx.preference.PreferenceScreen>