GC-1006 fix Preset two separator

resource/locales/en-US/translation.json

@@ -431,6 +431,7 @@
     "Preset one separator desc": "Blank line 3 lines",
     "Preset two separator": "Preset 2",
     "Preset two separator desc": "Markdown horizontal rule",
+    "Preset two separator value": "-----",
     "Custom separator": "Custom",
     "Custom separator desc": "Any character",
     "XSS_setting": "Prevent XSS(Cross Site Scripting) Setting",

resource/locales/ja/translation.json

@@ -448,6 +448,7 @@
     "Preset one separator desc": "空行を3行で改頁します",
     "Preset two separator": "プリセット 2",
     "Preset two separator desc": "Markdown の区切り線で改頁します",
+    "Preset two separator value": "-----",
     "Custom separator": "カスタム",
     "Custom separator desc": "任意の文字で改頁します",
     "XSS_setting": "XSS(Cross Site Scripting)対策設定",

src/server/views/admin/markdown.html

@@ -117,6 +117,7 @@
                 <p class="font-weight-bold">{{ t('markdown_setting.Preset two separator') }}</p>
                 <div class="m-t-15">
                     {{ t('markdown_setting.Preset two separator desc') }}
+                    <input class="form-control" type="text" name="markdownSetting[markdown:presentation:pageBreakCustomSeparator]" value="{{ t('markdown_setting.Preset two separator value') }}" readonly>
                 </div>
               </label>
           </div>