tdf#122616 UI Enhancement: Print dialog texts changed as requested in comments

Print dialog text's capitalization changed to follow the styles used in GNOME user interface elements.

Change-Id: I718c4776eaa28e98c5209d160cd47e27782b1101
Reviewed-on: https://gerrit.libreoffice.org/66093Reviewed-by: Gabor Kelemen <kelemen.gabor2@nisz.hu>
Tested-by: Jenkins
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

vcl/uiconfig/ui/printdialog.ui

@@ -527,7 +527,7 @@
                                             <property name="can_focus">False</property>
                                             <property name="halign">start</property>
                                             <property name="margin_left">8</property>
-                                            <property name="label" translatable="yes" context="printdialog|labelcopies">Number of Copies:</property>
+                                            <property name="label" translatable="yes" context="printdialog|labelcopies">Number of copies:</property>
                                             <property name="use_underline">True</property>
                                             <property name="mnemonic_widget">copycount</property>
                                           </object>
@@ -651,7 +651,7 @@
                                             <property name="can_focus">False</property>
                                             <property name="halign">start</property>
                                             <property name="margin_left">6</property>
-                                            <property name="label" translatable="yes" context="printdialog|labelpapersides">Paper Sides:</property>
+                                            <property name="label" translatable="yes" context="printdialog|labelpapersides">Paper sides:</property>
                                             <property name="use_underline">True</property>
                                             <property name="mnemonic_widget">sidesbox</property>
                                           </object>
@@ -698,7 +698,7 @@
                                         </child>
                                         <child>
                                           <object class="GtkCheckButton" id="reverseorder">
-                                            <property name="label" translatable="yes" context="printdialog|reverseorder">Print in Reverse Order</property>
+                                            <property name="label" translatable="yes" context="printdialog|reverseorder">Print in reverse order</property>
                                             <property name="visible">True</property>
                                             <property name="can_focus">True</property>
                                             <property name="receives_default">False</property>
@@ -779,7 +779,7 @@
                                         <property name="visible">True</property>
                                         <property name="can_focus">False</property>
                                         <property name="halign">start</property>
-                                        <property name="label" translatable="yes" context="printdialog|labelsize">Paper Size:</property>
+                                        <property name="label" translatable="yes" context="printdialog|labelsize">Paper size:</property>
                                         <property name="use_underline">True</property>
                                         <property name="mnemonic_widget">papersizebox</property>
                                       </object>