Use the current target in slide-in click handler
Use the current target in slide-in click handler

Otherwise the following doesn't work:
```
<a href data-toggle="slide-in" translate>foo</a>
```
The `translate` directive adds and extra `span` and it's this span that respond
to the click event.

adube/ngeo,camptocamp/ngeo,adube/ngeo,adube/ngeo,ger-benjamin/ngeo,ger-benjamin/ngeo,kalbermattenm/ngeo,Jenselme/ngeo,Jenselme/ngeo,kalbermattenm/ngeo,camptocamp/ngeo,Jenselme/ngeo,adube/ngeo,Jenselme/ngeo,camptocamp/ngeo,camptocamp/ngeo,kalbermattenm/ngeo,ger-benjamin/ngeo,camptocamp/ngeo