Comma (,) as decimal separator is ignored in time estimation fields

Issue Summary

If a user's language is set to English, the decimal separator for time tracking fields should be the dot (.).
Example: Original estimate = 3.5d -> The issue gets created with an original estimate of three days and a half

If the user uses comma (,) instead of dot (.), Jira simply ignores the comma character:
Example: Original estimate = 3,5d -> Issue gets created with 35 (thirty-five) days of original estimate.

Steps to Reproduce

1. Create an issue
2. In the Create issue screen, put the original estimate as "3,5d" (three comma five)

Expected Results

An error should be thrown, as the decimal separator is wrong.
This is the case when using ; as decimal separator
This is also the case when the user's language is French (where the decimal separator is the comma, ) but the user uses the dot (.).

Actual Results

Instead of throwing an error, Jira completely ignores the character and creates the issue with an original estimate 10 times larger.

This is also valid for issues created with REST API calls.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available