Credit offer repayment period "No limit"

[abitmore]

Describe the bug

When the repayment period of an offer is not within the predefined set of UI, it shows as "No limit".

To Reproduce
Steps to reproduce the behavior:

1. Go to https://develop.bitshares.org/#/lending/p2p
2. Scroll down to '1.21.67'
3. See error

Expected behavior
Correct values on the page.

Screenshots

Desktop (please complete the following information):
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Additional context
Add any other context about the problem here.

[xiangxn]

I have dealt with this issue, if you have time you can review and merge.

@sschiessl-bcp @abitmore

[abitmore]

Better add some white spaces. BTW "1Hours" and "1Days" look strange, they should be "1 hour" or "1 day". Actually, do we have some standard i18n library to use?

[xiangxn]

I have reformatted it.

@abitmore