Resolve "Bug: Temperature value cannot be entered with comma"

Why this change?

• On iOS, the numeric keyboard only allows to enter a comma
• Our temperature input field only allows numbers separated by dots

Description

• Replace comma in input with dot
• Additionally ensured that users can removed every number they input --> previously, it was only possible to remove digits but the last one would remain in the input field

Reviewing

Here's what I am looking for feedback on in particular:

Test on iOS

1. Open dialog to edit temperature with no previous temperature values and no value for the day, enter temperature and press save button

• temperature should be saved

2. Open dialog with previous temperature available

• value should be prefilled with the value of the last day for which a temperature was entered
• When clicking save button, prefilled value should be saved a temperature for that day

3. Open dialog for a day for which a temperature was saved

• value should be prefilled with the value that was previously saved
• When clicking save button, prefilled value should be saved a temperature for that day

In addition:

• Refactored temperature component to functional component
• Pre-filled the input with either data from props or data from previous temperatares that a user had saved
  • it is not required anymore to tap on the input field once to be able to save the data

Closes #540 (closed)