Winnows 404 content

[emileighoutlaw]

Related to: 18F/fec-style#266 (comment), which has been inspiring me to look more closely at our error and alert messages.

This is a small place we can trim content to help our readers.

Content-only PR. Anyone can review.

[codecov-io]

Current coverage is 55.20%

Merging #1170 into develop will decrease coverage by -0.08% as of fb0132b

@@            develop   #1170   diff @@
=======================================
  Files            17      17       
  Stmts          1250    1250       
  Branches        176     176       
  Methods           0       0       
=======================================
- Hit             691     690     -1
- Partial          27      28     +1
  Missed          532     532       

Review entire Coverage Diff as of fb0132b

---

Uncovered Suggestions

1. +0.96% via ...js/modules/tables.js#244...255
2. +0.88% via ...js/modules/tables.js#104...114
3. +0.72% via ...s/election-lookup.js#384...392
4. See 7 more...

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[noahmanger]

Thanks! Can you make the change on the CMS as well?