Change CustomFieldChoiceSet label separator from comma to colon

[arthanson]

NetBox version

v3.6.6

Feature type

Change to existing functionality

Proposed functionality

Change the CustomFieldChoiceSet label separator from a comma to a colon. Right now for CustomFieldChoiceSets the extra_choices uses a comma to separate out the label from the value for input:

        help_text=mark_safe(_(
            'Enter one choice per line. An optional label may be specified for each choice by appending it with a '
            'comma. Example:'
        ) + ' <code>choice1,First Choice</code>')

This FR would change it to be a colon.

Use case

From working on #13983 this allows nested arrays of these label,value in the CSV import, however commas are default separators for both CSV and the ArrayField. The commas are not stored anywhere they are just used to split the string, so changing to a colon should have no adverse effect and would allow not only easier and less confusing input of data for users, but would make the code simpler as well.

Database changes

None

External dependencies

None

[jeremystretch]

I actually prefer using a colon now that you mention it, as it feels more natural in a key-value mapping.