Spanish translation

[oarbusi-ng]

Added web-app/src/locales/es/translation.json and modified /web-app/src/i18n.js to have Poli in Spanish.

[codecov-io]

Codecov Report

Merging #41 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #41      +/-   ##
============================================
- Coverage     67.18%   67.11%   -0.07%     
+ Complexity      403      402       -1     
============================================
  Files            49       49              
  Lines          1554     1554              
  Branches        140      140              
============================================
- Hits           1044     1043       -1     
- Misses          464      466       +2     
+ Partials         46       45       -1

Impacted Files	Coverage Δ	Complexity Δ
.../com/shzlw/poli/service/JdbcDataSourceService.java	24.24% <0%> (-3.04%)	4% <0%> (-1%)

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