Sentence cased text everywhere

[rndstr]

Follows Weave Cloud's direction of sentence case on most things.

[bowenli]

I think keeping the "by foo" makes sense since it describes the grouping.

[bia]

LmostlyGTM.

• Some spacing issues become even more prominent in sentence case.
  
  I talked with @fbarl about it - the simplest solution would be to add about 5px more css padding around that text.

• Let's rename 'Containers-by-image' to 'Containers by image'?

I think keeping the "by foo" makes sense since it describes the grouping.

• We're addressing this in Make navigation more clear #3163

[rndstr]

@bia IMO the main problem is the table header does not line up with the column content (on osx and linux). And the horizontal padding in the header is 2px vs 4px for the content. Lining the headers up with the columns and increasing the padding to 4px looks good to me.

The misalignment appears to be intentional because we don't know how wide the scrollbar is on different OS' so we just pick an avg of 8px. See also #3158

[rndstr]

@bia just fixed the alignment and adjusted the padding in #3169, this is how it's going to look

[bia]

Cool, anyways that looks better. Maybe a little more space between the arrow and 'Processes'?