Bump superdesk-core from 25c8b35 to 18c5362 in /client (#354)

Bumps [superdesk-core](https://github.com/superdesk/superdesk-client-core) from `25c8b35` to `18c5362`.
- [Release notes](https://github.com/superdesk/superdesk-client-core/releases)
- [Commits](superdesk/superdesk-client-core@25c8b35...18c5362)

---
updated-dependencies:
- dependency-name: superdesk-core
  dependency-type: direct:production
...

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