Fix: Handle undefined LANG variable (#284)

* Fix: Handle undefined LANG variable

Fixes #283

Author: agnivade

lib/cache.js

@@ -22,10 +22,7 @@ class Cache {
 
   getPage(page) {
     let preferredPlatform = platform.getPreferredPlatformFolder(this.config);
-    let preferredLanguage = 'en';
-    if (process.env['LANG'] !== '') {
-      preferredLanguage = process.env['LANG'];
-    }
+    const preferredLanguage = process.env.LANG || 'en';
     return index.findPage(page, preferredPlatform, preferredLanguage)
       .then((folder) => {
         if (!folder) {

test/functional-test.sh

@@ -21,4 +21,5 @@ tldr --update && tldr-render-pages && \
 tldr --clear-cache && \
 tldr --update && tldr-render-pages && \
 LANG=pt_BR tldr-render-pages && \
+unset LANG && tldr-render-pages \
 tldr --search "disk space"