Typos

[jumpjack]

I think I found some typos:

• a missing space between number and unit of measure
• a missing header
• some missing units of measure
• inconsistent placement of "add" button (sometimes before, sometimes after the lists they refer to)

[TrystanLea]

Happy to accept a pull request with fixes for these if you make them. Everything apart from changing the location of the Add buttons, I'd prefer those left as they are. Thank you

[TrystanLea]

Also 'count' header needs to be left omitted due to limited screen space. It could be a 'title' mouse over tooltip perhaps..

[jumpjack]

But if I (now) understand correctly, the empty header is not the number of elements: it's the element the window/door refers to.
And "air changes per hour" are not m3, but how many times the total air volume is exchanged per hour, right?

[TrystanLea]

Yes thats correct, thanks!