Rename Swedish locale to sv.yml

[davidwessman]

• The Swedish locale is referred to as sv in the I18n-gem:
  https://github.com/svenfuchs/rails-i18n/blob/master/rails/locale/sv.yml
• It can also be referred to as sv_SE.

[davidwessman]

I decided to rename it completely, but feel free to keep the old file for backwards compatibility if that is needed.

[codecov]

Codecov Report

Merging #226 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
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  Coverage   100.00%   100.00%           
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  Files           26        26           
  Lines          530       530           
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  Hits           530       530           

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[ddnexus]

I think we should have a sv.yml containing the sv key and a sv-SE.yml containing sv-SE, since they are also in the official i18n gem. We used the same file/key naming for the zn-CH, zn-HK and the zn-TW.

Please, could you modify the PR accordingly?

[davidwessman]

I think we should have a sv.yml containing the sv key and a sv-SE.yml containing sv-SE, since they are also in the official i18n gem. We used the same file/key naming for the zn-CH, zn-HK and the zn-TW.

Please, could you modify the PR accordingly?

Done!

[ddnexus]

Thank you. I will add the needed changes for pluralization and deprecation.