Bug 33151: Improve translation of string in cities.tt and desks.tt

Bug 33151: Improve translation of string in cities.tt and desks.tt

This patch adds a <span> tag around a string in both cities.tt and
desks.tt in order to improve translatability.

To test apply the patch and run the translation script to update the .po
files, e.g.

perl misc/translator/translate update fr-FR

Check the updated .po files:
 - Before the patch you would have found 'msgid "%s Searching: %s %s %s'
 - After the patch you should find 'msgid "Searching: %s'

Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>