Support extensions with multiple parts (i.e. en.md)

Author: tech4him1

src/backends/github/implementation.js

@@ -1,6 +1,5 @@
 import trimStart from 'lodash/trimStart';
 import semaphore from "semaphore";
-import { fileExtension } from 'Lib/pathHelper'
 import AuthenticationPage from "./AuthenticationPage";
 import API from "./API";
 
@@ -53,7 +52,7 @@ export default class GitHub {
 
   entriesByFolder(collection, extension) {
     return this.api.listFiles(collection.get("folder"))
-    .then(files => files.filter(file => fileExtension(file.name) === extension))
+    .then(files => files.filter(file => file.name.endsWith('.' + extension)))
     .then(this.fetchFiles);
   }
 

src/backends/test-repo/implementation.js

@@ -1,6 +1,5 @@
 import { remove, attempt, isError } from 'lodash';
 import uuid from 'uuid/v4';
-import { fileExtension } from 'Lib/pathHelper'
 import AuthenticationPage from './AuthenticationPage';
 
 window.repoFiles = window.repoFiles || {};
@@ -45,7 +44,7 @@ export default class TestRepo {
     const folder = collection.get('folder');
     if (folder) {
       for (const path in window.repoFiles[folder]) {
-        if (fileExtension(path) !== extension) {
+        if (!path.endsWith('.' + extension)) {
           continue;
         }