a11y: fix missing labels in sw paragraph dialog textflow tab

Change-Id: I3173cf240131788013345aa864156286affa476d
Reviewed-on: https://gerrit.libreoffice.org/28657Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

cui/uiconfig/ui/textflowpage.ui

@@ -116,6 +116,7 @@
                     <property name="halign">start</property>
                     <property name="label" translatable="yes">C_haracters at line end</property>
                     <property name="use_underline">True</property>
+                    <property name="mnemonic_widget">spinLineEnd</property>
                   </object>
                   <packing>
                     <property name="left_attach">1</property>
@@ -129,6 +130,7 @@
                     <property name="halign">start</property>
                     <property name="label" translatable="yes">Cha_racters at line begin</property>
                     <property name="use_underline">True</property>
+                    <property name="mnemonic_widget">spinLineBegin</property>
                   </object>
                   <packing>
                     <property name="left_attach">1</property>
@@ -142,6 +144,7 @@
                     <property name="halign">start</property>
                     <property name="label" translatable="yes">_Maximum number of consecutive hyphens</property>
                     <property name="use_underline">True</property>
+                    <property name="mnemonic_widget">spinMaxNum</property>
                   </object>
                   <packing>
                     <property name="left_attach">1</property>
@@ -209,7 +212,7 @@
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">False</property>
-                    <property name="margin_left">25</property>
+                    <property name="margin_left">22</property>
                     <property name="use_underline">True</property>
                     <property name="xalign">0</property>
                     <property name="inconsistent">True</property>