fdo#81036 escape ~ in .ui and fix a typo (straight apostrophe)

Change-Id: I652dc63cc0e8fb04d7c3115d66d60dabda60f0f4
(cherry picked from commit 4861e4961f7dc4f28a14c5f9d9b969456bfec720)
Reviewed-on: https://gerrit.libreoffice.org/10143
Reviewed-by: Matúš Kukan <matus.kukan@collabora.com>
Tested-by: Matúš Kukan <matus.kukan@collabora.com>
diff --git a/starmath/uiconfig/smath/ui/smathsettings.ui b/starmath/uiconfig/smath/ui/smathsettings.ui
index 1b983c2..38fee44 100644
--- a/starmath/uiconfig/smath/ui/smathsettings.ui
+++ b/starmath/uiconfig/smath/ui/smathsettings.ui
@@ -239,7 +239,7 @@
                <property name="spacing">6</property>
                <child>
                  <object class="GtkCheckButton" id="norightspaces">
                    <property name="label" translatable="yes">Ig_nore ~ and ` at the end of the line</property>
                    <property name="label" translatable="yes">Ig_nore ~~ and ' at the end of the line</property>
                    <property name="visible">True</property>
                    <property name="can_focus">True</property>
                    <property name="receives_default">False</property>