[epiphany] prefs-dialog: Clarify tracker blocking option

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a57231e75cd0b460e78896e16a61b899207acccd
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Tue Nov 14 15:08:38 2017 -0600

    prefs-dialog: Clarify tracker blocking option
    
    https://bugzilla.gnome.org/show_bug.cgi?id=790189

 src/resources/gtk/prefs-dialog.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/resources/gtk/prefs-dialog.ui b/src/resources/gtk/prefs-dialog.ui
index 8fdba6b..96a4cb0 100644
--- a/src/resources/gtk/prefs-dialog.ui
+++ b/src/resources/gtk/prefs-dialog.ui
@@ -254,7 +254,7 @@
                         </child>
                         <child>
                           <object class="GtkCheckButton" id="do_not_track_checkbutton">
-                            <property name="label" translatable="yes">Try to block web _trackers</property>
+                            <property name="label" translatable="yes">Try to block web _trackers (including 
social media buttons)</property>
                             <property name="visible">False</property>
                             <property name="use-underline">True</property>
                             <property name="margin-start">12</property>