Configtool Update Recording Tab

fixes #540
- [x] Moved directory selection to recording tab
- [x] Added recording tab heading
- [x] Other refactoring (renaming variables to match style)
- [x] Replace directory edit button text with "Browse..."
- [x] Translation support for the various changes

![recording tab screenshot](https://cloud.githubusercontent.com/assets/5759678/4341547/53402794-403a-11e4-999d-2ee814fc753a.jpg)

Note: There is a slight alignment issue caused by these modifications in the General tab because of the way ConfigTool is setup, everything in the different tabs is right-aligned unless it is forced to be left-aligned by something like a QLineEdit.

![general tab screenshot](https://cloud.githubusercontent.com/assets/5759678/4341576/b77f0dce-403a-11e4-85db-7ccad3046136.jpg)

Instead of repeating this stylesheet, consider this
```python
subheader_style = """
    QGroupBox {
        font-weight: bold;
        font-size: {}{}
     }
""".format(self.fontSize + 1, self.fontUnit)

self.audioGroupBox.setStyleSheet(subheader_style)
self.videoGroupBox.setStyleSheet(subheader_style)
# etc
```