Correct description in messages; add 'tel' input type

Move description.txt to its proper place in the i18n messages file, and
add the 'tel' input data type.

BUG=615448
R=emilyschechter@chromium.org

Review URL: https://codereview.chromium.org//2235683003 .
4 files changed
tree: d5d5cc7936ec948ac9d257a4278cf8aa80c7ce3f
  1. go-back-with-backspace/
  2. .gitignore