/**
     * Get the value for the key 'online.help.base.link'. <br>
     * The value is, e.g. https://fess.codelibs.org/{lang}/{version}/admin/ <br>
     * comment: Base link for online help.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getOnlineHelpBaseLink();

    /**
     * Get the value for the key 'online.help.installation'. <br>

root-body-variables\n\n  --#{$prefix}heading-color: #{$headings-color};\n\n  --#{$prefix}link-color: #{$link-color};\n  --#{$prefix}link-color-rgb: #{to-rgb($link-color)};\n  --#{$prefix}link-decoration: #{$link-decoration};\n\n  --#{$prefix}link-hover-color: #{$link-hover-color};\n  --#{$prefix}link-hover-color-rgb: #{to-rgb($link-hover-color)};\n\n  @if $link-hover-decoration != null {\n    --#{$prefix}link-hover-decoration: #{$link-hover-decoration};\n  }\n\n  --#{$prefix}code-color: #{$code-color};\n  --#...

   margin-bottom: 0;\n  }\n  .form-inline .form-control {\n    display: inline-block;\n    width: auto;\n    vertical-align: middle;\n  }\n  .form-inline .form-control-plaintext {\n    display: inline-block;\n  }\n  .form-inline .input-group,\n  .form-inline .custom-select {\n    width: auto;\n  }\n  .form-inline .form-check {\n    display: flex;\n    align-items: center;\n    justify-content: center;\n    width: auto;\n    padding-left: 0;\n  }\n  .form-inline .form-check-input {\n    position:...