Fix i18n issues

[qifeng-bai]

Tasks:

1, Use the default English messages if messages are not available for a target language
2, Switch languages based on locale

Link to PR created by @vjrj
#428 (review)

TEST:

https://spatial-test.ala.org.au/?lang=ES
https://spatial-test.ala.org.au/?lang=DE

[vjrj]

The PR is from Georg @biodivAtlasAT (Austria) thanks @qifeng-bai I was trying to review it only.

[qifeng-bai]

@vjrj I have fixed up i18n issues and deployed on https://spatial-test.ala.org.au

You can switch languages by clicking the language button on the top left

[vjrj]

Thanks indeed @qifeng-bai !

[biodivAtlasAT]

Thank you!

…

________________________________ Von: vjrj ***@***.***> Gesendet: Donnerstag, 3. März 2022 08:41 An: AtlasOfLivingAustralia/spatial-hub ***@***.***> Cc: Georg Neubauer ***@***.***>; Mention ***@***.***> Betreff: Re: [AtlasOfLivingAustralia/spatial-hub] Fix i18n issues (Issue #433) Thanks indeed @qifeng-bai<https://github.com/qifeng-bai> ! — Reply to this email directly, view it on GitHub<#433 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ANPMCUG6ITUPWIIKDXYZBVLU6BUKPANCNFSM5OWLEV6A>. Triage notifications on the go with GitHub Mobile for iOS<https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android<https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[patkyn]

Tested and pass