Add ignored document lang option (#265)

This option allows you to list the locales for which you do not need to
apply translation.

src/_locales/en/messages.json

@@ -137,6 +137,12 @@
   "secondTargetLangCaptionLabel": {
     "message": "Select the second target language."
   },
+  "ignoredDocumentLangLabel": {
+    "message": "Ignore documents in the following languages"
+  },
+  "ignoredDocumentLangCaptionLabel": {
+    "message": "Comma separated languages that do not need to be translated."
+  },
   "waitTimeLabel": {
     "message": "Waiting time to translate"
   },

src/content/index.js

@@ -28,8 +28,12 @@ const handleMouseUp = async e => {
   if (!isLeftClick) return;
   if (isInPasswordField) return;
   if (isInThisElement) return;
+
   removeTranslatecontainer();
 
+  const ignoredDocumentLang = getSettings('ignoredDocumentLang').split(',').map(s => s.trim()).filter(s => !!s)
+  if (!!document.documentElement.lang && ignoredDocumentLang.includes(document.documentElement.lang)) return;
+
   const selectedText = getSelectedText();
   prevSelectedText = selectedText;
   if (selectedText.length === 0) return;

src/settings/defaultSettings.js

@@ -39,6 +39,15 @@ export default [
         options: langListOptions,
         useRawOptionName: true
       },
+      {
+        id: "ignoredDocumentLang",
+        title: "ignoredDocumentLangLabel",
+        captions: ["ignoredDocumentLangCaptionLabel"],
+        type: "text",
+        default: "",
+        placeholder: "en, ru, ch",
+        new: true,
+      },
       {
         id: "ifShowCandidate",
         title: "ifShowCandidateLabel",