[Settings] Refactor: Add App language layout

<?xml version="1.0" encoding="utf-8"?>

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<PreferenceScreen

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:settings="http://schemas.android.com/apk/res-auto"

    android:title="@string/app_locale_picker_title"

    android:key="key_app_language_picker_page">

    <com.android.settingslib.widget.TopIntroPreference

        android:key="app_locale_disclaimer"

        android:title="@string/desc_app_locale_disclaimer"

        settings:isPreferenceVisible="false"

        android:order="1"/>

    <com.android.settingslib.widget.IntroPreference

        android:key="app_intro"

        android:order="2"/>

    <com.android.settingslib.widget.TopIntroPreference

        android:key="app_locale_description"

        android:title="@string/desc_no_available_supported_locale"

        android:order="3"

        android:selectable="false"

        settings:isPreferenceVisible="false"

        settings:searchable="false"/>

    <PreferenceCategory

        android:key="app_language_suggested_category"

        android:title="@string/suggested_locales_title"

        android:order="4"/>

    <PreferenceCategory

        android:key="app_language_all_supported_category"

        android:title="@string/all_supported_locales_title"

        android:order="5"/>

</PreferenceScreen>