Bug 34942: Fix typo - 'brower' to 'browser'

Bug 34942: Fix typo - 'brower' to 'browser'

This fixes a typo in a message used in the advanced cataloguing
editor when macros are converted from being stored in the browser to
being stored in the database (bug 17268 - Advanced cataloging editor
- rancor - macros are lost when browser storage cleared).

Test plan:
1. Search for 'brower' in the codebase - there should be one occurance:
   grep -rn --exclude=*.po brower *
2. Apply the patch.
3. Run the search in step 1 again, there should now be no occurances.
4. Review the diff for the patch a nd make sure that the change makes
   sense.
5. Sign off! 8-)

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Andrew Fuerste-Henry <andrewfh@dubcolib.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>