Fix position/size of multi-locale language menu selector
The selector is behaving weirdly in two different ways:
1. It initially exceeds the height of the window (although the bottom portion is blank), but seems to fix itself when the user engages with it: [language-long-menu](/uploads/1ba8bc30226055810e08e1493586c131/language-long-menu.png)
2. The "top" position seems to be completely dislocated from the menu-button, and is attached to the top of the viewport instead: [language-top-menu](/uploads/3ffdf5c7fae0b82b1943c5e0001e81bb/language-top-menu.png)
issue