Catalog editor i18n

[tha-nordiq]

Description

Move url placeholders from hard coded values in MainFormUtils.js and MainForm.jsx to language files to allow i18n.

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe: i18n

Issue

What is the current behavior?
The url placeholders are always in english "e.g. https://mydomain.com/geoserver/wms"

What is the new behavior?
Now the url placeholders can be translated. Translations added for danish, german and spanish
"f.eks. https://mydomain.com/geoserver/wms"

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• Yes, and I documented them in migration notes
• No

Other useful information

[offtherailz]

@tha-nordiq thank you very much for contributing MapStore ❤️