filenaming error warning message on FUW

[only1chunts]

User Story

As author
I want to the file upload tool to prevent me from using filenames that are not compatible with GigaDB guidelines
So I cannot upload files with inappropriate filenames

Acceptance criteria

Given there is a file upload wizard
And I am an author using it to upload my files
When I attempt to add a file with a filename that does not comply with the following rules
Then I should see an error message prompting me to change those file names

Rules:
Filenames should not be more than 100char in length
Filenames should not include spaces. We recommend using the underscore (_) in place of spaces in the filenames.
Filenames should only include the following characters a-z,A-Z,0-9,_,-,+,.

Additional information

Related to ticket #1119

Product Backlog Item Ready Checklist

• Business value is clearly articulated
• Item is understood enough by the IT team so it can make an informed decision as to whether it can complete this item
• Dependencies are identified and no external dependencies would block this item from being completed
• At the time of the scheduled sprint, the IT team has the appropriate composition to complete this item
• This item is estimated and small enough to comfortably be completed in one sprint
• Acceptance criteria are clear and testable
• Performance criteria, if any, are defined and testable
• The Scrum team understands how to demonstrate this item at the sprint review

Product Backlog Item Done Checklist

• Item(s) in increment pass all Acceptance Criteria
• Code is refactored to best practices and coding standards
• Documentation is updated as needed
• Data security has not been compromised (with particular reference to the personal information we hold in GigaDB)
• No deviation from the team technology stack and software architecture has been introduced
• The product is in a releasable state (i.e. the increment has not broken anything)