Bug 15665: Better wording of error messages when importing MARC frameworks

Bug 15665: Better wording of error messages when importing MARC frameworks

UPDATE: Making error messages the same

To test:
1) Go to Admin -> MARC frameworks
2) Click Import next to any framework. You won't actually be overwriting or importing anything as this is only a string fix, so it can be an existing framework
3) Click the Import button without attaching any file. Confirm it says "Please select a spreadsheet (.csv, .ods, .xml) file." and that this makes sense to you
4) Attempt to attach a file that is not a .csv, .ods or .xml file. You should instantly get an error message saying "Please select a CSV (.csv), ODS (.ods) or XML (.xml) file." Confirm this shows up and makes sense to you

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Rewording Ok. Works as described

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com