Fix #1260, #1278, #1281, #1271, #1279

Fix #1278: 2 subscription checkbox's (janich)
Fix #1281: Missing language string COM_KUNENA_UNPUBLISHED in frontend
Fix #1271: "Quote:" text in emails isn't multilingual
Fix #1260 Rank Manager: Uploaded rank image not listed in old templates
Fix #1279 Announcements CP: Clicking "Edit" unpublishes announcement