added missing localization

lib/plugins/extension/helper/gui.php

@@ -124,9 +124,9 @@ class helper_plugin_extension_gui extends DokuWiki_Plugin {
         echo '</div>';
 
         $form = new Doku_Form(array('action' => $this->tabURL('', array(), '&'), 'enctype' => 'multipart/form-data', 'class' => 'install'));
-        $form->addElement(form_makeTextField('installurl', '', 'Install from URL:', '', 'block'));
-        $form->addElement(form_makeFileField('installfile', 'Upload Extension:', '', 'block'));
-        $form->addElement(form_makeButton('submit', '', 'Install'));
+        $form->addElement(form_makeTextField('installurl', '', $this->getLang('install_url'), '', 'block'));
+        $form->addElement(form_makeFileField('installfile', $this->getLang('install_upload'), '', 'block'));
+        $form->addElement(form_makeButton('submit', '', $this->getLang('btn_install')));
         $form->printForm();
     }
 

lib/plugins/extension/lang/en/lang.php

@@ -92,5 +92,7 @@ $lang['error_copy']                   = 'There was a file copy error while attem
 $lang['noperms']                      = 'Extension directory is not writable';
 $lang['notplperms']                   = 'Template directory is not writable';
 $lang['nopluginperms']                = 'Plugin directory is not writable';
-
 $lang['git']                          = 'This extension was installed via git, you may not want to update it here.';
+
+$lang['install_url']                  = 'Install from URL:';
+$lang['install_upload']               = 'Upload Extension:';
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