Add upload and installation errors.

res/app/components/stf/install/index.js

@@ -0,0 +1,4 @@
+module.exports = angular.module('stf.install-service', [
+  require('gettext').name
+])
+  .filter('installError', require('./install-error-filter'))

res/app/components/stf/install/install-error-filter.js

@@ -0,0 +1,12 @@
+// From here: https://github.com/android/platform_frameworks_base/blob/
+// master/core/java/android/content/pm/PackageManager.java#L371
+
+module.exports = function installErrorFilter(gettext) {
+  return function (text) {
+    return {
+      INSTALL_FAILED_OLDER_SDK: gettext('New package failed because the ' +
+      'current SDK version is older than that required by the package')
+      // TODO: do the rest
+    }[text] || text
+  }
+}

res/app/components/stf/install/install-spec.js

@@ -0,0 +1,13 @@
+describe('install', function() {
+
+  beforeEach(angular.mock.module(require('./').name))
+
+	it('should ...', inject(function($filter) {
+
+    var filter = $filter('install')
+
+		expect(filter('input')).toEqual('output')
+
+	}))
+
+})