iCloud calendar invites are sent in spanish, even though iCloud account is set in English

Hi community,

I know, this is a weird one. And since I didn't used my calendar for invites before I didn't notice. My account is an ex-MobileMe that may have been configured in spanish back in the day (I honestly can't remember) but I have been using english configuration since way before migrating to iCloud. Invites are sent fine to all invitees, the issue is that they receive them in spanish. This happens when invite are sent both from icloud.com or from my iPhone. My iCloud setting are:

• Language: English
• Timezone: Australian Eastern Standard Time

I tried to call "Express Lane" support, they kept me waiting on the phone for over 40 minutes after which I hanged-up; the person assisting me had no idea how to fix the issue.

Any help would be greatly appreciated!

Ivan