Rename 'Interactions' heading to 'Interactor' in annotation pop-up

[jseager7]

Currently, the section of the annotation pop-up that contains the pathogen or host role of the organism in an interaction is titled 'Interactions', but that doesn't seem very accurate or descriptive.

I think this title should be renamed to either 'Role' or 'Interactor'. 'Interactor' is more general and probably less likely to cause problems for annotations where the interaction isn't pathogen–host, such as Phyiscal Interaction annotations, but currently those annotations are displayed using a different layout anyway.

@martin2urban @CuzickA What do you think this title should be renamed to?

[jseager7]

We decided to rename this heading to 'Interactor'.

[jseager7]

Here's what the pop-up would look like with the above changes:

[jseager7]

Looks like this is done now.