Mods relateditems language

Closes #163, related to #143

Restructures the way mods metadata are ordered per @jvine spec.

Also, changes languages in mods to be one dd delimited by semi-colons

### Before - ww121ss5000
![screen shot 2014-08-15 at 7 21 14 am](https://cloud.githubusercontent.com/assets/1656824/3934130/d27e7700-2487-11e4-99f2-1cac658a1152.png)

### After
![screen shot 2014-08-15 at 7 20 19 am](https://cloud.githubusercontent.com/assets/1656824/3934131/da9c0c2c-2487-11e4-9cfd-2837696c4628.png)

#### The only fields left in upper metadata section are primary names and description. ww779nm2965
![screen shot 2014-08-15 at 7 20 28 am](https://cloud.githubusercontent.com/assets/1656824/3934151/05a4f5f0-2488-11e4-84bd-9d710cb8a881.png)