add i18n support and English translations

[nobodyiam]

No description provided.

[coveralls]

Coverage decreased (-0.004%) to 53.779% when pulling e2c71b5 on nobodyiam:i18n into f050e44 on ctripcorp:master.

[JaredTan95]

LGTM

The English translation new feature makes Apollo more professional.

[JaredTan95]

We are going to merge this great feature.

FYI @czd890, and thanks for your contributions.

[codecov-io]

Codecov Report

Merging #2641 into master will decrease coverage by <.01%.
The diff coverage is 9.09%.

@@             Coverage Diff              @@
##             master    #2641      +/-   ##
============================================
- Coverage     50.23%   50.22%   -0.01%     
  Complexity     2061     2061              
============================================
  Files           413      413              
  Lines         12647    12648       +1     
  Branches       1294     1294              
============================================
  Hits           6353     6353              
- Misses         5845     5846       +1     
  Partials        449      449

Impacted Files	Coverage Δ	Complexity Δ
.../com/ctrip/framework/apollo/common/dto/AppDTO.java	0% <ø> (ø)	0 <0> (ø)	⬇️
.../ctrip/framework/apollo/common/dto/ClusterDTO.java	0% <ø> (ø)	0 <0> (ø)	⬇️
.../framework/apollo/common/utils/InputValidator.java	88.88% <ø> (ø)	5 <0> (ø)	⬇️
...trip/framework/apollo/common/dto/NamespaceDTO.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...framework/apollo/portal/entity/model/AppModel.java	84.21% <ø> (ø)	11 <0> (ø)	⬇️
...p/framework/apollo/common/entity/AppNamespace.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...apollo/portal/controller/PermissionController.java	5.75% <0%> (ø)	1 <0> (ø)	⬇️
...amework/apollo/portal/util/RelativeDateFormat.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...pollo/openapi/v1/controller/ClusterController.java	20% <0%> (ø)	1 <0> (ø)	⬇️
...amework/apollo/common/controller/WebMvcConfig.java	0% <0%> (ø)	0 <0> (ø)	⬇️
... and 3 more

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