Remove the term “Persona” from visible UI strings

Their official name is “Firefox Themes” nowadays.
While I was there, tweak some strings.

Change-Id: I2505df2fb810fa7de51d28f5704bc1178671c3ac
Reviewed-on: https://gerrit.libreoffice.org/11483Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>

cui/source/options/personalization.src

@@ -21,12 +21,12 @@
 
 String RID_SVXSTR_SEARCHTERM
 {
-    Text [ en-US ] = "Search term...";
+    Text [ en-US ] = "Search term";
 };
 
 String RID_SVXSTR_SELECTEDPERSONA
 {
-    Text [ en-US ] = "Selected Persona: ";
+    Text [ en-US ] = "Selected Theme: ";
 };
 
 String RID_SVXSTR_SEARCHING
@@ -46,7 +46,7 @@ String RID_SVXSTR_NORESULTS
 
 String RID_SVXSTR_APPLYPERSONA
 {
-    Text [ en-US ] = "Applying persona..";
+    Text [ en-US ] = "Applying Theme...";
 };
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

cui/uiconfig/ui/personalization_tab.ui

 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.16.1 -->
+<!-- Generated with glade 3.18.3 -->
 <interface>
   <requires lib="gtk+" version="3.0"/>
   <object class="GtkVBox" id="PersonalizationTabPage">
@@ -28,7 +28,7 @@
                 <property name="spacing">12</property>
                 <child>
                   <object class="GtkRadioButton" id="no_persona">
-                    <property name="label" translatable="yes">Plain look, do not use Themes</property>
+                    <property name="label" translatable="yes">Default look, do not use Themes</property>
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">False</property>
@@ -154,7 +154,7 @@
                   <object class="GtkLabel" id="extensions_label">
                     <property name="can_focus">False</property>
                     <property name="xalign">0</property>
-                    <property name="label" translatable="yes">Or, select from the personas installed via extensions</property>
+                    <property name="label" translatable="yes">Or, select from the Themes installed via extensions:</property>
                   </object>
                   <packing>
                     <property name="expand">True</property>

cui/uiconfig/ui/select_persona_dialog.ui

@@ -5,7 +5,7 @@
   <object class="GtkDialog" id="SelectPersonaDialog">
     <property name="can_focus">False</property>
     <property name="border_width">6</property>
-    <property name="title" translatable="yes">Select Persona</property>
+    <property name="title" translatable="yes">Select Firefox Theme</property>
     <property name="type_hint">dialog</property>
     <child internal-child="vbox">
       <object class="GtkBox" id="dialog-vbox1">
@@ -389,7 +389,7 @@
               <object class="GtkLabel" id="label6">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
-                <property name="label" translatable="yes">Suggested themes by category</property>
+                <property name="label" translatable="yes">Suggested Themes by Category</property>
                 <attributes>
                   <attribute name="weight" value="bold"/>
                 </attributes>