Several json files don't including all strings

We have project structure

```
project
|- module1
   |- locals
      |- en.po
      |- fr.po
|- module2
   |- locals
      |- en.po
      |- fr.po
```

start

``` javascript
'compiled/locals' : ['project/**/*.po']
```

have result

```
compiled
|- locals
   |- en.json
   |- fr.json
```

But en/ru.json have string only from module2
