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