#2858 Added feature for showing contributions hours view and PDF letter download

[symmetrically]

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[benwbrum]

The code looks good to me!

[saracarl]

This is super exciting! Folks are really going to like having this.

Here's the changes the letter needs:

1. Get rid of "figure 1: logo" under the logo:
   

2. Change the date from this:
   

to the more formal:

3. Can we add an extra line/carriage return after the date and before the "To Whom it May Concern"?

4. Every place we say "From the Page" it should be "FromThePage" (my example letter was wrong on this).

5. Dates in the text of the letter need to be formally written out as well:
   

6. In the table, could we give the collection name more space and the page count less space? (Maybe right justify the page counts?)
   

7. Let's add another carriage return after "Regards,"

8. There should be a line break between "Sara Brumfield" and "Partner, Brumfield Labs".
   

9. In two places in the text, we break the words with a hyphen:
   
   

I'd really prefer that the word moves to the following line. (@benwbrum may have some ideas on that.)

[benwbrum]

I'm not entirely sure what to do about the line breaks with collec- -- there are a handful of options you can pass to Pandoc, so could we explore a bit?

Let's right-justify the Pages Count column and rename the header to Pages. That may give us a bit more room for the collection. (Note that we had to use a special markdown tables plugin when we run Pandoc in the work PDF export, which is passed in as a command-line argument.)

[saracarl]

Ok. 2 more small changes:

1. Add a carriage return between the logo and the date.
2. Make sure it's FromThePage, not FromthePage. (Branding!) It's wrong 2 places and correct 1 place.

Otherwise, looks good.

[saracarl]

Messages are missing:
letter (2).pdf

I would probably have added the messages to the dashboard messages file, to match the controller you're using. With your current setup, you can probably make this work by fully qualifying the message references, i.e. hours_letter.pdf.letter.certification_text

We use i18n-tasks to do a lot of this work; it makes it much easier. I'll send an email with some details about that library and our google translate key. (I probably wouldn't use it with this PR, because it requires starting over, but I would with all the ones in the future.)