Show trailing zeros with bytes pipe

[matej-cupka]

[ ] bug report
[x] feature request

Current behavior
While using bytes pipe like this:
{{ file.size | bytes:2 }}
it shows 2 decimals only if there are 2 decimals. If the file size is let's say 128kB it won't show "128.00 kB"

Expected behavior
Show trailing zeros if the number doesn't have enough decimals to show

What is the motivation / use case for changing the behavior?
Easier to read file sizes when the text is aligned to right.