Make sure the localeIdentifier is passed correctly

[mvanbeusekom]

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...)

Bug fix

⤵️ What is the current behavior?

Currently the localeIdentifier is not past correctly to the native side of the plugin.

🆕 What is the new behavior (if this is a feature change)?

Correctly pass the localeIdentifier parameter and act accordingly.

💥 Does this PR introduce a breaking change?

No

🐛 Recommendations for testing

1. Open the example app;
2. Pass a correctly locale identifier to the placemarkFromCoordinates and locationFromAddress methods;
3. Run the example app and verify the app displays the information in the correct locale.

📝 Links to relevant issues/docs

Fixes #10

🤔 Checklist before submitting

• All projects build
• Follows style guide lines (code style guide)
• Relevant documentation was updated
• Rebased onto current develop

[codecov]

Codecov Report

Merging #11 into develop will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           develop       #11   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          119       119           
=========================================
  Hits           119       119           

Impacted Files	Coverage Δ
geocoding/lib/geocoding.dart	100.00% <ø> (ø)

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