Add Regular Expression Custom Format translation

(cherry picked from commit 9f50166fa62a71d0a23e2c2d331651792285dc0e)

Closes #4506

frontend/src/Settings/CustomFormats/CustomFormats/Specifications/EditSpecificationModalContent.js

@@ -49,7 +49,7 @@ function EditSpecificationModalContent(props) {
           {...otherProps}
         >
           {
-            fields && fields.some((x) => x.label === 'Regular Expression') &&
+            fields && fields.some((x) => x.label === translate('CustomFormatsSpecificationRegularExpression')) &&
               <Alert kind={kinds.INFO}>
                 <div>
                   <div dangerouslySetInnerHTML={{ __html: 'This condition matches using Regular Expressions. Note that the characters <code>\\^$.|?*+()[{</code> have special meanings and need escaping with a <code>\\</code>' }} />

src/NzbDrone.Core/CustomFormats/Specifications/RegexSpecificationBase.cs

@@ -21,7 +21,7 @@ public abstract class RegexSpecificationBase : CustomFormatSpecificationBase
         protected Regex _regex;
         protected string _raw;
 
-        [FieldDefinition(1, Label = "Regular Expression", HelpText = "Custom Format RegEx is Case Insensitive")]
+        [FieldDefinition(1, Label = "CustomFormatsSpecificationRegularExpression", HelpText = "CustomFormatsSpecificationRegularExpressionHelpText")]
         public string Value
         {
             get => _raw;

src/NzbDrone.Core/Localization/Core/en.json

@@ -239,6 +239,8 @@
   "CustomFormatScore": "Custom Format Score",
   "CustomFormatSettings": "Custom Format Settings",
   "CustomFormats": "Custom Formats",
+  "CustomFormatsSpecificationRegularExpression": "Regular Expression",
+  "CustomFormatsSpecificationRegularExpressionHelpText": "Custom Format RegEx is Case Insensitive",
   "Customformat": "Custom Format",
   "CutoffFormatScoreHelpText": "Once this custom format score is reached {appName} will no longer grab album releases",
   "CutoffHelpText": "Once this quality is reached {appName} will no longer download albums",