Templates modal converted to bootstrap

Same as #4575 #4563 #4562 #4561 #4514 #4513

Tests:
Follow the images to navigate:
![screenshot 2014-10-12 23 29 30](https://cloud.githubusercontent.com/assets/3889375/4607439/b3fc7364-524e-11e4-86d7-45230a611fbc.png)
![screenshot 2014-10-12 23 29 44](https://cloud.githubusercontent.com/assets/3889375/4607440/b7611c30-524e-11e4-90b9-d1036f1319e5.png)

And:
![screenshot 2014-10-12 23 29 58](https://cloud.githubusercontent.com/assets/3889375/4607441/ba0c1f16-524e-11e4-9f21-5d728f997c64.png)
![screenshot 2014-10-12 23 30 13](https://cloud.githubusercontent.com/assets/3889375/4607442/c1f354ce-524e-11e4-8448-3b4f11b424b0.png)

Practically this is an internal function of com_templates, and will not break anything else.
Best way to find out is by testing...