Bug 10083 [3.10.x] In Transit string doesn't get translated in the staff interface

For some reason this text inside a <td> isn't getting picked up by the
translator unless it's inside a <span>. This patch adds the span and
tidies up the text.

To test, apply the patch and "translate update" a translation. Searching
the po file for "In transit from" should return a result from detail.pl.

Signed-off-by: Gaetan Boisson <gaetan.boisson@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>