Ensure that we load the survey in the phone language

Notably, when the phone language is Spanish, we want to load the spanish
version of the survey. This is apparently functionality that is in the most
recent version of enketo, but not in our older version.

We can apply the patch that introduced the change
enketo/enketo-core@c31dccc
but we can't do it directly since we only have the bundle included as a
manually imported library in our code.

So we apply the patch by copy-pasting. This works.

Difference between versions: e-mission/e-mission-docs#732 (comment)
Patch fix: e-mission/e-mission-docs#732 (comment)

www/js/survey/enketo/service.js

@@ -5,7 +5,7 @@ angular.module('emission.survey.enketo.service', [
   'emission.survey.enketo.answer'
 ])
 .factory('EnketoSurvey', function(
-  $window, $http, UnifiedDataLoader,
+  $window, $http, $translate, UnifiedDataLoader,
   InputMatcher, EnketoSurveyAnswer,
 ) {
   /**
@@ -77,7 +77,9 @@ angular.module('emission.survey.enketo.service', [
       external: opts.external || [],
       session: opts.session || {}
     };
-    _state.form = new $window.FormModule(formSelector, data, {});
+    const currLang = $translate.use();
+    _state.form = new $window.FormModule(formSelector, data,
+        {language: currLang});
     return _state.form.init();
   }
 

www/manual_lib/enketo/enketo-bundle.js

@@ -48622,7 +48622,7 @@ var enketocore = (function () {
 	 */
 
 	var languageModule = {
-	    init() {
+	    init( overrideLang ) {
 	        if ( !this.form ) {
 	            throw new Error( 'Language module not correctly instantiated with form property.' );
 	        }
@@ -48646,7 +48646,15 @@ var enketocore = (function () {
 	            }
 	        }
 	        this.formLanguages = root.querySelector( '#form-languages' );
-	        this._currentLang = this.formLanguages.dataset.defaultLang || languages[ 0 ] || '';
+
+
+            if ( overrideLang && languages.includes( overrideLang ) ) {
+                this._currentLang = overrideLang;
+                this.setUi( this._currentLang );
+            } else {
+                this._currentLang = this.formLanguages.dataset.defaultLang || languages[ 0 ] || '';
+            }
+
 	        const langOption = this.formLanguages.querySelector( `[value="${this._currentLang}"]` );
 	        const currentDirectionality = langOption && langOption.dataset.dir || 'ltr';
 
@@ -49419,7 +49427,7 @@ var enketocore = (function () {
 	        this.calc.update();
 
 	        // before itemset.update
-	        this.langs.init();
+	        this.langs.init( this.options.language );
 
 	        // before repeats.init so that template contains role="page" when applicable
 	        this.pages.init();