Increase precision on relative time offsets

[int-y1]

Fixes #1846. Makes moment.js redundant. The new relative time messages will be:

• 1 second to 119 seconds
• 2 minutes to 179 minutes
• 3 hours to 47 hours
• 2 days to 99 days

This diff is friendly towards i18n. German example:

As a failsafe, always use absolute time if the browser doesn't support Math.trunc and Intl.RelativeTimeFormat. For example, IE11.

[codecov-commenter]

Codecov Report

Merging #1990 (4c7f6d0) into master (1bd9be0) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1990   +/-   ##
=======================================
  Coverage   46.51%   46.51%           
=======================================
  Files         236      236           
  Lines       13085    13085           
=======================================
  Hits         6086     6086           
  Misses       6999     6999           

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[int-y1]

Fun fact: Intl.RelativeTimeFormat supports fractional amounts, e.g. rtf.format(-3.14159, 'minute') becomes '3.142 minutes ago'.

I only used integer amounts in this pr, because there's no need for fractional amounts right now.

[Xyene]

2 minutes to 179 minutes

👀