I think in cases like this, something like the following would be better:
```javascript
var titleFrom = OpenLayers.i18n('searchDateFrom');
```
where `searchDateFrom` = 'min'.

The variable name is more abstracted (from its value) and more descriptive.  It means that if we wanted to change the text to say 'start' or 'from' instead of 'min', the code would still look ok.  As it stands currently, changing the value of 'min' to 'start' in `en.js` would be a bit confusing, IMHO.