diff --git a/frontend/src/Components/Filter/Builder/FilterBuilderModalContent.js b/frontend/src/Components/Filter/Builder/FilterBuilderModalContent.js
index d860d82f3..0c4a31657 100644
--- a/frontend/src/Components/Filter/Builder/FilterBuilderModalContent.js
+++ b/frontend/src/Components/Filter/Builder/FilterBuilderModalContent.js
@@ -1,3 +1,4 @@
+import { maxBy } from 'lodash';
 import PropTypes from 'prop-types';
 import React, { Component } from 'react';
 import FormInputGroup from 'Components/Form/FormInputGroup';
@@ -50,7 +51,7 @@ class FilterBuilderModalContent extends Component {
       if (id) {
         dispatchSetFilter({ selectedFilterKey: id });
       } else {
-        const last = customFilters[customFilters.length -1];
+        const last = maxBy(customFilters, 'id');
         dispatchSetFilter({ selectedFilterKey: last.id });
       }
 
@@ -108,7 +109,7 @@ class FilterBuilderModalContent extends Component {
       this.setState({
         labelErrors: [
           {
-            message: 'Label is required'
+            message: translate('LabelIsRequired')
           }
         ]
       });
@@ -146,13 +147,13 @@ class FilterBuilderModalContent extends Component {
     return (
       <ModalContent onModalClose={onModalClose}>
         <ModalHeader>
-          Custom Filter
+          {translate('CustomFilter')}
         </ModalHeader>
 
         <ModalBody>
           <div className={styles.labelContainer}>
             <div className={styles.label}>
-              Label
+              {translate('Label')}
             </div>
 
             <div className={styles.labelInputContainer}>
@@ -195,7 +196,7 @@ class FilterBuilderModalContent extends Component {
 
         <ModalFooter>
           <Button onPress={onCancelPress}>
-            Cancel
+            {translate('Cancel')}
           </Button>
 
           <SpinnerErrorButton
@@ -203,7 +204,7 @@ class FilterBuilderModalContent extends Component {
             error={saveError}
             onPress={this.onSaveFilterPress}
           >
-            Save
+            {translate('Save')}
           </SpinnerErrorButton>
         </ModalFooter>
       </ModalContent>
diff --git a/frontend/src/Components/Filter/CustomFilters/CustomFilter.js b/frontend/src/Components/Filter/CustomFilters/CustomFilter.js
index 7407f729a..9f378d5a2 100644
--- a/frontend/src/Components/Filter/CustomFilters/CustomFilter.js
+++ b/frontend/src/Components/Filter/CustomFilters/CustomFilter.js
@@ -37,8 +37,8 @@ class CustomFilter extends Component {
       dispatchSetFilter
     } = this.props;
 
-    // Assume that delete and then unmounting means the delete was successful.
-    // Moving this check to a ancestor would be more accurate, but would have
+    // Assume that delete and then unmounting means the deletion was successful.
+    // Moving this check to an ancestor would be more accurate, but would have
     // more boilerplate.
     if (this.state.isDeleting && id === selectedFilterKey) {
       dispatchSetFilter({ selectedFilterKey: 'all' });
diff --git a/src/NzbDrone.Core/Localization/Core/en.json b/src/NzbDrone.Core/Localization/Core/en.json
index b5e420eab..28970aa83 100644
--- a/src/NzbDrone.Core/Localization/Core/en.json
+++ b/src/NzbDrone.Core/Localization/Core/en.json
@@ -186,6 +186,7 @@
   "CreateEmptyAuthorFolders": "Create empty author folders",
   "CreateEmptyAuthorFoldersHelpText": "Create missing author folders during disk scan",
   "CreateGroup": "Create group",
+  "CustomFilter": "Custom Filter",
   "CustomFormat": "Custom Format",
   "CustomFormatScore": "Custom Format Score",
   "CustomFormatSettings": "Custom Format Settings",
@@ -470,6 +471,7 @@
   "Iso639-3": "ISO 639-3 language codes, or 'null', comma separated",
   "ItsEasyToAddANewAuthorOrBookJustStartTypingTheNameOfTheItemYouWantToAdd": "It's easy to add a New Author or Book just start typing the name of the item you want to add",
   "Label": "Label",
+  "LabelIsRequired": "Label is required",
   "Language": "Language",
   "Large": "Large",
   "LastDuration": "Last Duration",