uploads selector texts is now different when attachments are enabled

You can now customize *all* the texts in the upload selector modal depending on whether attachments are enabled or not. (Images are **always** enabled)

Images only:
![image_only-2](https://f.cloud.github.com/assets/362783/831754/86c9192a-f20e-11e2-9eb1-750fa08927d9.png)

With attachments:
![image and attachments](https://f.cloud.github.com/assets/362783/831753/86c5dc88-f20e-11e2-9ab4-2af984729c0a.png)

The strings used when attachments are enabled all ends with: `_with_attachments`.

***Sidenote:*** How the *hell* do I enabled attachments you might ask? Well, by adding a non-image extension to the `authorized_extensions` setting.