tdf#114873: localize Letter, fax and agenda wizards

Since we use contextual messages, we need to concatenate:
- context
- EOT character
- the message itself
see https://www.gnu.org/software/gettext/manual/html_node/MO-Files.html

A priori, regression from 00657aef

Change-Id: Ie3e781e30ce09f0121afff2f0eb0769b1fbd2114
Reviewed-on: https://gerrit.libreoffice.org/47521Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jean-Baptiste Faure <jbfaure@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

wizards/com/sun/star/wizards/common/strings.hrc

@@ -20,7 +20,10 @@ gettext.bindtextdomain('wiz', unohelper.fileUrlToSystemPath(
 gettext.textdomain('wiz')
 
 def NC_(context, string):
-    return gettext.gettext(string)
+    # Contextual strings are stored with the concatenation of
+    # the context, a EOT byte, and the original string, instead of the original string
+    # see https://www.gnu.org/software/gettext/manual/html_node/MO-Files.html
+    return gettext.gettext(context + chr(4) + string)
 
 # common section
 RID_COMMON_START_0                      = NC_("RID_COMMON_START_0", "The directory '%1' could not be created.<BR>There may not be enough space left on your hard disk.")