custom resolvers enabled

See issue: https://github.com/Kdyby/Translation/issues/46

Use like this:

```yaml
services:
	-
		class: Phc\Localization\WebsiteResolver
		tags: [translation.resolver: 10]
	-
		class: Phc\Localization\WebsiteResolverLast
		tags: [translation.resolver: 20]
```

or

```yaml
translation:
	resolvers:
		- Phc\Localization\WebsiteResolverLast
		- Phc\Localization\WebsiteResolver
```

or

```yaml
services:
	- Phc\Localization\WebsiteResolverLast
	- Phc\Localization\WebsiteResolver

translation:
	resolvers:
		- @Phc\Localization\WebsiteResolverLast
		- @Phc\Localization\WebsiteResolver
```
I just copied your Event solution, where it's used. It has same api, so I guess you got some reason for it. It it's changed, this can be change too ofc.