feat: support *.properties resource files

test/index.test.js

@@ -98,6 +98,27 @@ describe('koa-locales.test.js', function () {
         .expect(200, done);
       });
 
+      it('should use query locale: de on *.properties format', function (done) {
+        request(app.callback())
+        .get('/?locale=de')
+        .expect({
+          email: 'Emailde',
+          hello: 'Hallo fengmk2, wie geht es dir heute?',
+          message: 'Hallo fengmk2, wie geht es dir heute? Wie war dein 18.',
+          empty: '',
+          notexists_key: 'key not exists',
+          empty_string: '',
+          novalue: 'key %s ok',
+          arguments3: '1 2 3',
+          arguments4: '1 2 3 4',
+          arguments5: '1 2 3 4 5',
+          arguments6: '1 2 3 4 5. 6',
+          values: 'foo bar foo bar {2} {100}',
+        })
+        .expect('Set-Cookie', /^locale=de; path=\/; expires=\w+/)
+        .expect(200, done);
+      });
+
       it('should use query locale and change cookie locale', function (done) {
         request(app.callback())
         .get('/?locale=zh-CN')
@@ -284,8 +305,8 @@ describe('koa-locales.test.js', function () {
         request(app.callback())
         .get('/?locale=')
         .expect({
-          email: 'Email',
-          hello: 'Hello fengmk2, how are you today?',
+          email: '郵箱',
+          hello: 'fengmk2，今天過得如何？',
           message: 'Hello fengmk2, how are you today? How was your 18.',
           empty: '',
           notexists_key: 'key not exists',

test/locales/de.properties

@@ -0,0 +1,3 @@
+Email = Emailde
+"Hello %s, how are you today?" = "Hallo %s, wie geht es dir heute?"
+Hello %s, how are you today? How was your %s. = Hallo %s, wie geht es dir heute? Wie war dein %s.

test/locales/zh-CN.js

@@ -1,4 +1,4 @@
 module.exports = {
-  'Email': '邮箱',
+  Email: '邮箱',
   'Hello %s, how are you today?': '%s，今天过得如何？',
 };

test/locales/zh_TW.json

@@ -1,3 +1,4 @@
 {
-  
+  "Email": "郵箱",
+  "Hello %s, how are you today?": "%s，今天過得如何？"
 }