OFS-118: fixing 'replace' mutation in CP module

[sniedzielski]

In that pull request I want to merge changes realted with updating replace mutations after fixing it in core module and PH module.

Another pull requests related to this issue:

• policy holder: OFS-118: fixing replace mutation in PolicyHolder openimis-be-policyholder_py#12
• core: OFS-118: fixing replace mutations and replace in model openimis-be-core_py#29