optimize navbar style

[lepdou]

1. optimize logo's size
2. change search input's with from 350px to 375px
3. add switch language icon

before

after

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[codecov-commenter]

Codecov Report

Merging #4073 (53cbc6e) into master (02a4df5) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #4073   +/-   ##
=========================================
  Coverage     51.69%   51.69%           
- Complexity     2548     2549    +1     
=========================================
  Files           484      484           
  Lines         14844    14844           
  Branches       1536     1536           
=========================================
+ Hits           7673     7674    +1     
  Misses         6637     6637           
+ Partials        534      533    -1     

Impacted Files	Coverage Δ
.../apollo/internals/RemoteConfigLongPollService.java	78.31% <0.00%> (+0.60%)	⬆️

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[nobodyiam]

looks nice