add NL translation

because i did not find any solutions on some oc dashboard items, which do not have an optimal height, i started to modify ocDasgboard.css for myself.
For those you are interested for a quick an dirty fix, just add the following lines:

within .dashboardItem {
border: 0px rgb(230,230,230) solid;
float: left;
width: 300px;
height: 300px;
changed to ---> height: 50%;

within .ocDashboard.items {
text-align: left; 
overflow: auto; 
height: 184px; 
changed to ----> height: 100%; 
}

But this is not very sexy, During my experiments i found out, that an automatic placement might be controlled via the sequence of placing them onto the dashboard and fillings them up into the collumns.

with float: top they should be placed below its predessor.

e.g.:
1 | 4 | 7
2 | 5 |
3 | 6 |

That will place them in my way, but without user interaction.

![image](https://cloud.githubusercontent.com/assets/8484647/3959306/749e47f0-272a-11e4-8c07-9317bb7cd5cf.png)


This is not comparable to a manual placement and saving this actual settings. This feature is very helpful, if you browse on a iPhone/iPad. There you cannot move the gadets on the dashboard!
They are not selectable. Thats why i request some automatic placement in a very easy way for implementation I think/hope ...

What do you think about that?
kind regards
michael