Remove invariant culture, date must change with users settings; fixes#1139

[jaimeatstariongroup]

… #1139

Prerequisites

• [x] I have written a descriptive pull-request title
• [x] I have verified that there are no overlapping pull-requests open
• [x] I have verified that I am following the COMET-IME code style guidelines
• [x] I have provided test coverage for my change (where applicable)

Description

The invariant culture filter has been removed. The Dates must change with the user local settings.

[lxatstariongroup]

Was already changed in another issue