[gnome-disk-utility] Add tooltip text to Auto-clear switch

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 24f5b80514ef87d7ecae70f5a91f1f84f848fd15
Author: Kai Lüke <kailueke riseup net>
Date:   Sat Mar 25 14:32:06 2017 +0100

    Add tooltip text to Auto-clear switch
    
    Closing #769461 which points out that the auto-clear option for loop
    devices is nowhere explained in the UI.
    From its UDisks description: "If TRUE, the kernel will automatically clear
    the loop device when the last closer closes the device. This typically
    happens when the loop device is unmounted."
    I chose the wording "Detach loop device after unmount action".

 src/disks/ui/disks.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/disks/ui/disks.ui b/src/disks/ui/disks.ui
index feee333..adf3771 100644
--- a/src/disks/ui/disks.ui
+++ b/src/disks/ui/disks.ui
@@ -530,6 +530,7 @@
                               <object class="GtkSwitch" id="devtab-loop-autoclear-switch">
                                 <property name="visible">True</property>
                                 <property name="can_focus">True</property>
+                                <property name="tooltip_text" translatable="yes">Detach loop device after 
unmount action</property>
                               </object>
                               <packing>
                                 <property name="expand">False</property>