Merge similar but not quite identical translated strings.

Some translated strings appeared several times in almost but not quite
identical form. Remove a few of them so that they don't have to be translated
multiple times.

Closes #13637.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69828 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/threadpsx.cpp

@@ -815,7 +815,7 @@ void *wxThreadInternal::PthreadStart(wxThread *thread)
     int rc = pthread_setspecific(gs_keySelf, thread);
     if ( rc != 0 )
     {
-        wxLogSysError(rc, _("Cannot start thread: error writing TLS"));
+        wxLogSysError(rc, _("Cannot start thread: error writing TLS."));
 
         return (void *)-1;
     }