this fixes #353

Author: gorhill

_locales/de/messages.json

@@ -500,12 +500,12 @@
         "description": "English: Apply changes"
     },
     "ubiquitousFormatHint" : {
-        "message": "Eine Regel pro Zeile. Eine Regel kann ein einfacher Hostname sein oder ein Adblock Plus-kompatibler Filter. Zeilen mit vorangestelltem ‘#’ werden ignoriert.",
+        "message": "Eine Regel pro Zeile. Eine Regel kann ein einfacher Hostname sein oder ein <a href='https://adblockplus.org/de/filters'>Adblock Plus-kompatibler Filter</a>. Zeilen mit vorangestelltem &lsquo;#&rsquo; werden ignoriert.",
         "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousAllowFormatHint" : {
         "message": "Eine Regel pro Zeile. Eine Regel kann ein einfacher Hostname sein oder ein Adblock Plus-kompatibler Ausnahme-Filter. Zeilen mit vorangestelltem &lsquo;#&rsquo; werden ignoriert.",
-        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
+        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter (prefixed with &lsquo;@@&rsquo;). Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousImport" : {
         "message": "Importieren und anfügen",

_locales/en/messages.json

@@ -500,12 +500,12 @@
         "description": "English: Apply changes"
     },
     "ubiquitousFormatHint" : {
-        "message": "One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible filter. Lines prefixed with ‘#’ will be ignored.",
+        "message": "One rule per line. A rule can be a plain hostname, or an <a href='https://adblockplus.org/en/filters'>Adblock Plus-compatible filter</a>. Lines prefixed with &lsquo;#&rsquo; will be ignored.",
         "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousAllowFormatHint" : {
-        "message": "One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter. Lines prefixed with &lsquo;#&rsquo; will be ignored.",
-        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
+        "message": "One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter (prefixed with &lsquo;@@&rsquo;). Lines prefixed with &lsquo;#&rsquo; will be ignored.",
+        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter (prefixed with &lsquo;@@&rsquo;). Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousImport" : {
         "message": "Import and append",

_locales/fr/messages.json

@@ -500,12 +500,12 @@
         "description": "English: Apply changes"
     },
     "ubiquitousFormatHint" : {
-        "message": "Une règle par ligne. Une règle peut être un simple nom d'hôte, ou encore un filtre respectant la syntaxe des filtres Adblock Plus. Les lignes débutant par ‘#’ seront ignorées.",
+        "message": "Une règle par ligne. Une règle peut être un simple nom d'hôte, ou encore un filtre respectant la <a href='https://adblockplus.org/en/filters'>syntaxe des filtres Adblock Plus</a>. Les lignes débutant par &lsquo;#&rsquo; seront ignorées.",
         "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousAllowFormatHint" : {
         "message": "Une règle par ligne. Une règle peut être un simple nom d'hôte, ou encore un filtre respectant la syntaxe des filtres d'exception Adblock Plus. Les lignes débutant par &lsquo;#&rsquo; seront ignorées.",
-        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
+        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter (prefixed with &lsquo;@@&rsquo;). Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousImport" : {
         "message": "Importer",

_locales/ru/messages.json

@@ -500,12 +500,12 @@
         "description": "English: Apply changes"
     },
     "ubiquitousFormatHint" : {
-        "message": "Одно правило на строку. Правилом может быть обычное имя сайти, или Adblock Plus-совместимый фильтр. Линии начинающиеся с ‘#’ будут пропущены.",
+        "message": "Одно правило на строку. Правилом может быть обычное имя сайти, или <a href='https://adblockplus.org/ru/filters'>Adblock Plus-совместимый фильтр</a>. Линии начинающиеся с &lsquo;#&rsquo; будут пропущены.",
         "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousAllowFormatHint" : {
         "message": "Одно правило на строку. Правилом может быть обычное имя сайти, или Adblock Plus-совместимый фильтр. Линии начинающиеся с &lsquo;#&rsquo; будут пропущены.",
-        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
+        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter (prefixed with &lsquo;@@&rsquo;). Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousImport" : {
         "message": "Импортировать и добавить",

_locales/zh_CN/messages.json

@@ -500,12 +500,12 @@
         "description": "English: Apply changes"
     },
     "ubiquitousFormatHint" : {
-        "message": "每行一条规则。一条规则可以是一个平凡的站点名或者是一条Adblock Plus的兼容过滤规则。以“#”开头的行将被忽略。",
+        "message": "每行一条规则。一条规则可以是一个平凡的站点名或者是一条<a href='https://adblockplus.org/zh_CN/filters'>Adblock Plus的兼容过滤规则</a>。以“#”开头的行将被忽略。",
         "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousAllowFormatHint" : {
         "message": "每行一条规则。一条规则可以是一个平凡的站点名或者是一条Adblock Plus的兼容过滤规则。以“#”开头的行将被忽略。",
-        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter. Lines prefixed with &lsquo;#&rsquo; will be ignored."
+        "description": "English: One rule per line. A rule can be a plain hostname, or an Adblock Plus-compatible exception filter (prefixed with &lsquo;@@&rsquo;). Lines prefixed with &lsquo;#&rsquo; will be ignored."
     },
     "ubiquitousImport" : {
         "message": "导入并附加规则",