Fixed i18n api_key.global.is_set and .not_set

The following property values were exchanged: page.redmine_configuration.settings.api_key.global.is_set and page.redmine_configuration.settings.api_key.global.not_set
Merge pull request #9 from AnAnAsbAnAnAshAkAr/patch-1

Fixed i18n api_key.global.is_set and .not_set