feat: expose i18n object by adding setter and getter

vursen commented 4 months ago

Description

The PR provides public access to the i18n object of DateTimePicker by adding setter and getter methods.

[!NOTE] The i18n object has only two properties at the moment: dateLabel and timeLabel. These properties specify a suffix to be added to the aria-label of DatePicker and TimePicker, where the first part of that aria-label is the aria-label or label of DateTimePicker. Due to an API design issue, we also have methods setDateAriaLabel and setTimeAriaLabel set these suffixes despite their name suggesting they set the whole aria-label (overriding the default aria-label format). Ideally, they would be changed to set the whole aria-label while suffixes would only be set through i18n. However, this would be a significant breaking change, which is too big to be included in a minor version. So, for now, it was decided to keep these properties in i18n and also retain these methods, with the difference that the methods will store their labels separately from i18n and their labels will take precedence over the labels set through i18n to avoid undesired side effects.

Part of #4618