Fixed-Zero quantity in messages doesn't work in English

[ashishkumar468]

Description (required)
Fixed-Zero quantity in messages doesn't work in English
Fixes #343

What changes did you make and why?

• Removed the quantity item zero from string plural contributions_subtitle
• Handled zero upload count from MainActivity

Tests performed (required)

Tested betaDebug on API 27

[codecov-io]

Codecov Report

Merging #4057 (d828ec8) into master (0f9d462) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #4057      +/-   ##
============================================
- Coverage     10.61%   10.61%   -0.01%     
  Complexity      476      476              
============================================
  Files           343      343              
  Lines         12871    12872       +1     
  Branches        997      998       +1     
============================================
  Hits           1366     1366              
- Misses        11437    11438       +1     
  Partials         68       68              

Impacted Files	Coverage Δ	Complexity Δ
...r/free/nrw/commons/contributions/MainActivity.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)

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[misaochan]

Thanks @ashishkumar468 !