catch errors, fix: dee999e5b8cf94fe37781087d0f33242864f4498
data: cleanup

postfix for grid/model init via db/read `metaData` is '+init'
l10n: updates
node.js callback style for `App.backend.req()`

```
App.backend.req('/ns/action2', function callback(err, json){})
App.backend.req('/ns/action3', { data: 'data'}, function callback(...){})
```