[gnome-tweak-tool] sound: enable amplify above 100 percent key

[Jeremy Bicha <jbicha src gnome org>]

commit 0d0fe3c03ffd89f9ee3aaf34d7e17f50e2a350d1
Author: Didier Roche <didrocks ubuntu com>
Date:   Wed Jan 10 14:56:29 2018 +0100

    sound: enable amplify above 100 percent key
    
    Add an option to enable amplifying main volume output above 100% in a new
    "sound" category.
    
    Note that the sound panel is not installed yet because the new option
    isn't used in GNOME yet.
    
    If it was installed, you'll need gsettings-desktop-schemas 3.27
    for the sound panel to display.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=791276

 gtweak/tweaks/tweak_group_sound.py |   16 ++++++++++++++++
 po/POTFILES.in                     |    1 +
 2 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/gtweak/tweaks/tweak_group_sound.py b/gtweak/tweaks/tweak_group_sound.py
new file mode 100644
index 0000000..78705ef
--- /dev/null
+++ b/gtweak/tweaks/tweak_group_sound.py
@@ -0,0 +1,16 @@
+# Copyright (c) 2017 Canonical
+# SPDX-License-Identifier: GPL-3.0+
+# License-Filename: LICENSES/GPL-3.0
+
+from gi.repository import Gio, GLib, Gtk
+
+import gtweak
+from gtweak.tweakmodel import Tweak
+from gtweak.widgets import ListBoxTweakGroup, GSettingsSwitchTweak
+
+TWEAK_GROUPS = [
+    ListBoxTweakGroup(_("Sound"),
+        GSettingsSwitchTweak(_("Over-Amplification"), "org.gnome.desktop.sound", 
"allow-volume-above-100-percent",
+                        desc=_("Allows raising the volume above 100%. This can result in a loss of audio 
quality; it is better to increase application volume settings, if possible.")),
+    )
+]
diff --git a/po/POTFILES.in b/po/POTFILES.in
index abd1e57..93e35e4 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -12,6 +12,7 @@ gtweak/tweaks/tweak_group_xkb.py
 gtweak/tweaks/tweak_group_power.py
 gtweak/tweaks/tweak_group_shell_extensions.py
 gtweak/tweaks/tweak_group_startup.py
+gtweak/tweaks/tweak_group_sound.py
 gtweak/tweaks/tweak_group_top_bar.py
 gtweak/tweaks/tweak_group_windows.py
 gtweak/tweaks/tweak_group_workspaces.py