Words together when translate menu

[Jorge Maldonado Ventura]

When we translate with `po4a-translate -f texinfo -m ./bashref.texi -p
./bashref.es.po -l ./bashref.es.texi` on long lines from @menu some
words lose the separation space they had in the PO file. We're
using po4a-translate Version 0.47. Here
<https://notabug.org/jorgesumle/bashrefes/issues/27> are more details
about our issue, we think it's a bug.