improve locale utility to fix #1691 and #1694

[Xiaochao8]

No description provided.

[codecov]

Codecov Report

Merging #1699 (2f9deff) into g11n-ruby-client (c2c5c20) will decrease coverage by 9.79%.
The diff coverage is 35.10%.

@@                 Coverage Diff                  @@
##           g11n-ruby-client    #1699      +/-   ##
====================================================
- Coverage             73.33%   63.54%   -9.80%     
====================================================
  Files                    10       14       +4     
  Lines                   180      288     +108     
====================================================
+ Hits                    132      183      +51     
- Misses                   48      105      +57     

Flag	Coverage Δ
coverage	63.54% <35.10%> (-9.80%)	⬇️

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Impacted Files	Coverage Δ
lib/sgtn-client/cldr/localized_str.rb	100.00% <ø> (ø)
lib/sgtn-client/util/validate-util.rb	76.47% <ø> (+1.47%)	⬆️
lib/sgtn-client/api/translation.rb	26.98% <25.80%> (ø)
lib/sgtn-client/core/config.rb	61.79% <31.81%> (-9.85%)	⬇️
lib/sgtn-client/exceptions.rb	100.00% <100.00%> (ø)
lib/sgtn-client/sgtn-client.rb	83.67% <100.00%> (ø)
lib/singleton-client.rb	100.00% <100.00%> (ø)
lib/singleton-ruby.rb	100.00% <100.00%> (ø)
lib/sgtn-client/core/exceptions.rb
lib/sgtn-client/core/logging.rb	64.70% <0.00%> (ø)
... and 2 more

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