Fix situations like "</itemizedlist>Some text"

Summary:
With XML files containing e.g.

<para><itemizedlist>
  (...)
</itemizedlist>Some text</para>

one character is eaten: variable start_col starts at "ome text", and the translation match is not done by po2xml (can't find ... in ... message is displayed).

Reviewers: aacid

Differential Revision: https://phabricator.kde.org/D20559