Chart adjustments (#53).

[Wmaileq]

Description of the change

Adjustments on:

• chart tooltips
• chart not available state
• case when metric has only one data point
• "0%" and "+0%" issue
• thousand separators

Type of change

• [X] Bug fix (non-breaking change that fixes an issue)
• [ ] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Configuration change (adjusts configuration to achieve some end related to functionality, development, performance, or security)

Related issues

Closes #53.

Checklists

Development

These boxes should be checked by the submitter prior to merging:

• [X] Manual testing against realistic data has been performed locally

Code review

These boxes should be checked by reviewers prior to merging:

• [x] This pull request has a descriptive title and information useful to a reviewer
• [x] This pull request has been moved out of a Draft state, has no "Work In Progress" label, and has assigned reviewers
• [x] Potential security implications or infrastructural changes have been considered, if relevant

[jessex]

@hobuobi could you also do a quick test on this one, and respond to the comment from Vlad on #53? He needs fixture data to reproduce one of the issues you called out. I've done a quick review and I think he's solved all of the issues that are testable from my end, except for one problem I note in my review below, but I want you to sign off.

[hobuobi]

Almost everything looks great! The only thing is that I still see the +0% issue (for example, the Probation Population on US_ND).

[Wmaileq]

Finally i was able to reproduce Collin's issue. I think now it is ready to be shipped.