Use Unicode ellipses in two new strings

See https://developer.gnome.org/hig/stable/typography.html

https://bugzilla.gnome.org/show_bug.cgi?id=788392

Author: piotrdrag

data/ui/encoding-selector.ui

@@ -28,7 +28,7 @@
         <property name="has_focus">True</property>
         <property name="is_focus">False</property>
         <property name="activates_default">True</property>
-        <property name="placeholder_text" translatable="yes">Search text encoding...</property>
+        <property name="placeholder_text" translatable="yes">Search text encoding…</property>
       </object>
       <packing>
         <property name="left_attach">0</property>

data/ui/language-selector.ui

@@ -28,7 +28,7 @@
         <property name="has_focus">True</property>
         <property name="is_focus">False</property>
         <property name="activates_default">True</property>
-        <property name="placeholder_text" translatable="yes">Search highlight mode...</property>
+        <property name="placeholder_text" translatable="yes">Search highlight mode…</property>
       </object>
       <packing>
         <property name="left_attach">0</property>