diff --git a/app/components/bs-form.js b/app/components/bs-form.js
index 57cbdc16b..c2fe3d63e 100644
--- a/app/components/bs-form.js
+++ b/app/components/bs-form.js
@@ -11,7 +11,7 @@ export default class BsForm extends BaseBsForm {
   async validate(model) {
     const isInvalid = Object.getOwnPropertyNames(
       Object.getPrototypeOf(model),
-    ).any((potentialValidationKey) => {
+    ).some((potentialValidationKey) => {
       // Validation getters must be named `propertyValidation` by our convention
       if (!potentialValidationKey.endsWith('Validation')) {
         return false;
diff --git a/app/components/create-options-dates.js b/app/components/create-options-dates.js
index 5ba9c424e..32c5f1936 100644
--- a/app/components/create-options-dates.js
+++ b/app/components/create-options-dates.js
@@ -12,10 +12,14 @@ export default class CreateOptionsDates extends Component {
     // Options may contain the same date multiple times with different ime
     // Must filter out those duplicates as otherwise unselect would only
     // remove one entry but not all duplicates.
-    return this.args.options
-      .map(({ value }) => DateTime.fromISO(value).toISODate())
-      .uniq()
-      .map((isoDate) => DateTime.fromISO(isoDate));
+    return Array.from(
+      // using Set to remove duplicate values
+      new Set(
+        this.args.options.map(({ value }) =>
+          DateTime.fromISO(value).toISODate(),
+        ),
+      ),
+    ).map((isoDate) => DateTime.fromISO(isoDate));
   }
 
   get calendarCenterNext() {
diff --git a/app/components/create-options-datetime.js b/app/components/create-options-datetime.js
index 0a54a4264..4145a1fe0 100644
--- a/app/components/create-options-datetime.js
+++ b/app/components/create-options-datetime.js
@@ -35,7 +35,7 @@ class FormDataOption {
     const optionsForThisDay = formData.optionsGroupedByDay[day];
     const isDuplicate = optionsForThisDay
       .slice(0, optionsForThisDay.indexOf(this))
-      .any((option) => option.time == this.time);
+      .some((option) => option.time == this.time);
     if (isDuplicate) {
       return new IntlMessage('create.options-datetime.error.duplicatedDate');
     }
diff --git a/app/components/create-options.js b/app/components/create-options.js
index 598854978..c8f9cb9ee 100644
--- a/app/components/create-options.js
+++ b/app/components/create-options.js
@@ -51,7 +51,7 @@ class FormData {
       return new IntlMessage('create.options.error.notEnoughDates');
     }
 
-    if (options.any((option) => !option.isValid)) {
+    if (options.some((option) => !option.isValid)) {
       return new IntlMessage('create.options.error.invalidOption');
     }
 
diff --git a/app/controllers/create/settings.js b/app/controllers/create/settings.js
index fa062ff0f..0288b8299 100644
--- a/app/controllers/create/settings.js
+++ b/app/controllers/create/settings.js
@@ -94,7 +94,7 @@ export default class CreateSettings extends Controller {
     // set timezone if there is atleast one option with time
     if (
       poll.isFindADate &&
-      poll.options.any((option) => {
+      poll.options.toArray().some((option) => {
         return option.hasTime;
       })
     ) {
diff --git a/app/controllers/poll-error.js b/app/controllers/poll-error.js
index f27c132da..9fd3d4e74 100644
--- a/app/controllers/poll-error.js
+++ b/app/controllers/poll-error.js
@@ -7,6 +7,6 @@ export default class PollErrorController extends Controller {
   }
 
   get notFound() {
-    return this.model.errors.firstObject.status === '404';
+    return this.model.errors[0].status === '404';
   }
 }
diff --git a/app/instance-initializers/i18n.js b/app/instance-initializers/i18n.js
index e846f21f9..2221f104a 100644
--- a/app/instance-initializers/i18n.js
+++ b/app/instance-initializers/i18n.js
@@ -19,34 +19,27 @@ export default {
 };
 
 function getLocale(availableLocales) {
-  let methods = [getSavedLocale, getLocaleByBrowser];
-  let locale;
-
-  methods.any((method) => {
-    let preferredLocales = method();
-    let match;
+  for (const method of [getSavedLocale, getLocaleByBrowser]) {
+    const preferredLocales = method();
 
     if (isEmpty(preferredLocales)) {
-      return false;
+      continue;
     }
 
-    match = preferredLocales.find((preferredLocale) => {
-      return availableLocales.indexOf(preferredLocale) !== -1;
-    });
+    const supportedPreferredLocale = preferredLocales.find(
+      (preferredLocale) => {
+        return availableLocales.indexOf(preferredLocale) !== -1;
+      },
+    );
 
-    if (isEmpty(match)) {
-      return false;
+    if (isEmpty(supportedPreferredLocale)) {
+      continue;
     }
 
-    locale = match;
-    return true;
-  });
-
-  if (locale) {
-    return locale;
-  } else {
-    return 'en';
+    return supportedPreferredLocale;
   }
+
+  return 'en';
 }
 
 function getLocaleByBrowser() {
diff --git a/app/models/poll.js b/app/models/poll.js
index 590aa88fb..d932fc218 100644
--- a/app/models/poll.js
+++ b/app/models/poll.js
@@ -73,7 +73,7 @@ export default class Poll extends Model {
       return false;
     }
 
-    return this.options.any((option) => {
+    return this.options.toArray().some((option) => {
       let dayStringLength = 10; // 'YYYY-MM-DD'.length
       return option.title.length > dayStringLength;
     });
diff --git a/app/templates/create/index.hbs b/app/templates/create/index.hbs
index 004e16a54..adec14b98 100644
--- a/app/templates/create/index.hbs
+++ b/app/templates/create/index.hbs
@@ -2,7 +2,6 @@
   <BsForm
     @formLayout="horizontal"
     @model={{@model.formData}}
-    @onInvalid={{(scroll-first-invalid-element-into-view-port)}}
     @onSubmit={{this.submit}}
     as |form|
   >
diff --git a/config/environment.js b/config/environment.js
index 089752343..2bb483893 100644
--- a/config/environment.js
+++ b/config/environment.js
@@ -8,7 +8,7 @@ module.exports = function (environment) {
     locationType: 'hash',
     EmberENV: {
       EXTEND_PROTOTYPES: {
-        Array: true,
+        Array: false,
         Date: false,
         String: false,
         Function: true,
diff --git a/tests/acceptance/participate-in-a-poll-test.js b/tests/acceptance/participate-in-a-poll-test.js
index c08d98ca5..979471812 100644
--- a/tests/acceptance/participate-in-a-poll-test.js
+++ b/tests/acceptance/participate-in-a-poll-test.js
@@ -71,9 +71,7 @@ module('Acceptance | participate in a poll', function (hooks) {
     assert.equal(currentRouteName(), 'poll.participation');
     assert.equal(find('.name input').value, '', 'input for name is cleared');
     assert.notOk(
-      findAll('input[type="radio"]')
-        .toArray()
-        .some((el) => el.checked),
+      findAll('input[type="radio"]').some((el) => el.checked),
       'radios are cleared',
     );