fix(I18nHead): meta locale urls (#38)

* - avoid generating alternate for default locale
- use string concat instead of path
* fix: avoid printing default language alternate
* Update I18nHead.tsx
added missing trailing slash on root directory URL
* fix(I18nHead): meta locale urls
Co-authored-by: Alessandro Maruccia <alesmaru@gmail.com>

CHANGELOG.md

@@ -4,7 +4,6 @@ All notable changes to this project will be documented in this file. See [standa
 
 ### [4.17.4](https://github.com/openscript-ch/gatsby-plugin-i18n-l10n/compare/v4.17.3...v4.17.4) (2022-06-30)
 
-
 ### 🐛 Bug Fixes
 
 * slug translation ([355c0d7](https://github.com/openscript-ch/gatsby-plugin-i18n-l10n/commit/355c0d7c8e7cc68d8aa404011681edd230f71d3e))

jest-preprocess.js

@@ -1,4 +1,8 @@
 const babelOptions = {
-  presets: ["babel-preset-gatsby", "@babel/preset-typescript"],
+  presets: [
+    "babel-preset-gatsby", 
+    "@babel/preset-typescript", 
+    ["@babel/preset-react", { "runtime": "automatic" }]
+  ],
 }
 module.exports = require("babel-jest").default.createTransformer(babelOptions)

jest.config.js

@@ -11,6 +11,7 @@ module.exports = {
   globals: {
     __PATH_PREFIX__: ``,
   },
+  testEnvironment: 'jsdom',
   testEnvironmentOptions: {
     url: `http://localhost`
   },