[WIP] Refactor Hazard Models for multi analysis i18n

[lucernae]

Change lists:

General

• Create mixins for Hazard, Impact and Report model.

EQ

• Refactor Admin Page
• Add Generic Impact model for all hazard events
• Add constants for multi analysis i18n
• Add migration files
• Refactor methods and properties of EQ Model to support multi analysis i18n
• Refactor EQ Serializer to optimize query time
• Add cache flag field in EQ Model to optimize query time
• Refactor and add locale params for inasafe_wrapper headless tasks
• Refactor analysis and report generations of EQ events
• Add management files to bulk update new EQ Model cache flag field for query optimizations

Flood

• Refactor Flood to use multi language analysis
• Add Flood scenario integration tests
• Fix bug in ReportMixin

Ashes

• Refactor Ash to use multi language analysis
• Add Ash scenario integration tests
• Fix bug in hazard mixins

[codecov[bot]]

Codecov Report

Merging #294 into develop_v4 will increase coverage by 0.19%. The diff coverage is 60.46%.

@@              Coverage Diff               @@
##           develop_v4     #294      +/-   ##
==============================================
+ Coverage       54.62%   54.82%   +0.19%     
==============================================
  Files              83       85       +2     
  Lines            3555     3734     +179     
  Branches          287      301      +14     
==============================================
+ Hits             1942     2047     +105     
- Misses           1544     1615      +71     
- Partials           69       72       +3

Impacted Files	Coverage Δ
...ject/realtime/serializers/earthquake_serializer.py	97.91% <ø> (ø)	:arrow_up:
...me/management/commands/updateshakemapscacheflag.py	0% <0%> (ø)
django_project/realtime/app_settings.py	94.87% <100%> (ø)	:arrow_up:
...project/realtime/tasks/headless/inasafe_wrapper.py	58.82% <100%> (ø)	:arrow_up:
django_project/realtime/tasks/earthquake.py	35.67% <47.61%> (+1.91%)	:arrow_up:
django_project/realtime/models/earthquake.py	66.66% <64.6%> (-1.49%)	:arrow_down:
django_project/realtime/models/impact.py	85% <85%> (ø)
django_project/realtime/admin.py	98.78% <94.73%> (-1.22%)	:arrow_down:
django_project/realtime/models/volcano.py	91.11% <0%> (-2.64%)	:arrow_down:
... and 6 more

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[lucernae]

I'm going to merge it even if the test failed. I need to test it on live server.