added testlang to help translators

package.json

@@ -14,7 +14,8 @@
 		"lint": "eslint src/**/*.{js,vue} --fix",
 		"lint-tests": "eslint src/**/*.js --fix",
 		"test": "jest",
-		"test-watch": "jest --watch"
+		"test-watch": "jest --watch",
+		"testlang": "node ./tests/testlang.js"
 	},
 	"dependencies": {
 		"@vue/composition-api": "1.0.6",

tests/testlang.js

@@ -0,0 +1,52 @@
+async function loadLang(lang_id) {
+	let language_module
+	const result = []
+	try {
+		language_module = await import(`../src/lang/${lang_id}.mjs`)
+		language_module = language_module.default
+	} catch (e) {
+		language_module = {}
+	}
+	function parseObject(obj, root = '') {
+		for (const [key, value] of Object.entries(obj)) {
+			if (typeof value === 'string') {
+				result.push(root + key)
+			} else {
+				parseObject(value, root + key + '.')
+			}
+		}
+	}
+	parseObject(language_module)
+	return result
+}
+
+async function testLang(lang_id) {
+	const baseLangFile = await loadLang('en')
+	const comparedLangFile = await loadLang(lang_id)
+
+	if (comparedLangFile.length === 0) {
+		console.log(`Language file ${lang_id} doesn't exist!`)
+		return
+	}
+
+	console.log('\nMissing Keys:')
+	baseLangFile.forEach(key => {
+		if (!comparedLangFile.includes(key)) console.log(key)
+	})
+
+	console.log('\nExtra Keys:')
+	comparedLangFile.forEach(key => {
+		if (!baseLangFile.includes(key)) console.log(key)
+	})
+}
+
+;(async () => {
+	const args = process.argv.slice(2)
+	if (args.length !== 1) {
+		console.log('Usage:\nyarn testlang [COUNTRY_ID]\n')
+		return
+	}
+	console.log(`Testing language file ${args[0]}`)
+	await testLang(args[0])
+	console.log('')
+})()