TZ Portfolio Plus 2.1.5 available

Hi folks,
We're happy to announce that TZ Portfolio+ has already been available. This release contains some bug fixes and improvements. Let's have a look at all these changes and get yours updated as soon as possible.

**Bug fixes**
1. Fix error save preset's thumbnail of style.
2. Fix error edit form and enter tag of edit form in front-end.
3. Fix error language conflict of Joomla Content Vote.
4. Fix some styles of add-ons and styles online.

**Improvements**
5. Add demo link for addons and styles online.
6. Add "View All Portfolios" button link for module TZ Portfolio+ Portfolio.
6. Change language files of add-ons and styles (with prefix "plg_" to "tp_addon_" and "tpl_" to "tp_style_".
7. Optimize packages.

If you encounter any issues during update, feel free to give us your feedback. Any comments and suggestions are welcome.