Looking at the current calendar view in Redmine it is visible that @issues@ are translated to English as being @tasks@ in the calendar-legend. This can be confusing now that we also have subtasks (instead of subissues). This affects not only the English language but probably others (eg. Dutch) too.
This issue seems caused by the fact that the i18n-strings used by the calendar view are a bit confusing. They contain @task@ instead of @issue@ in their names.

I attach a patch which fixes the probable cause of the issue for all languages[1], as well as the actual translation issue in both the English (@en@) and Dutch (@nl@) translation-files.

fn1. by changing the following three i18n-strings which are used in /app/views/calendars/show.html.erb (only):

• from @:text_tip_task_begin_day@ to @:text_tip_issue_begin_day@
• from @:text_tip_task_end_day@ to @:text_tip_issue_end_day@
• from @:text_tip_task_begin_end_day@ to @:text_tip_issue_begin_end_day@