Dashboard: Tidy layout of gender display headings

[Brian Lewis]

Please go back to the samples in #462

No need to have Vertical

No need for full words Total Male Female

Tot M F will do , or All M F where that is appropriate,

Can we have some styling to make the totalsmore apparent and group the columns?

[Ghislain Hachey]

I don't think it is necessary to shorten to M F Tot. Resolving this.