Copy the plist xml code below to file "/Users/.../Library/Application\ Support/BBEdit/Language\ Modules/Twig.plist"
Kind regards.
<?xml version="1.0" encoding="UTF-8"?>
<plist version="1.0">
<dict>
<key>BBEditDocumentType</key>
<string>CodelessLanguageModule</string>
<key>BBLMColorsSyntax</key>
<true/>
<key>BBLMIsCaseSensitive</key>
<true/>
<key>BBLMKeywordList</key>
<array>
<string>__FILE__</string>
<string>abstract</string>
<string>array</string>
<string>as</string>
<string>autoescape</string>
<string>block</string>
<string>break</string>
<string>case</string>
<string>class</string>
<string>echo</string>
<string>else</string>
<string>elseif</string>
<string>embed</string>
<string>endautoescape</string>
<string>endblock</string>
<string>endembed</string>
<string>endfilter</string>
<string>endfor</string>
<string>endif</string>
<string>endjavascripts</string>
<string>endmacro</string>
<string>endsandbox</string>
<string>endset</string>
<string>endspaceless</string>
<string>endstopwatch</string>
<string>endtrans</string>
<string>endtranschoice</string>
<string>endverbatim</string>
<string>extends</string>
<string>false</string>
<string>filter</string>
<string>for</string>
<string>foreach</string>
<string>form_theme</string>
<string>function</string>
<string>if</string>
<string>ignore</string>
<string>implements</string>
<string>in</string>
<string>include</string>
<string>interface</string>
<string>is</string>
<string>javascripts</string>
<string>macro</string>
<string>missing</string>
<string>namespace</string>
<string>new</string>
<string>not</string>
<string>null</string>
<string>only</string>
<string>parent</string>
<string>private</string>
<string>protected</string>
<string>public</string>
<string>require_once</string>
<string>return</string>
<string>sandbox</string>
<string>set</string>
<string>spaceless</string>
<string>static</string>
<string>stopwatch</string>
<string>switch</string>
<string>throw</string>
<string>trans</string>
<string>trans_default_domain</string>
<string>transchoice</string>
<string>true</string>
<string>use</string>
<string>verbatim</string>
<string>with</string>
</array>
<key>BBLMLanguageCode</key>
<string>TWIG</string>
<key>BBLMLanguageDisplayName</key>
<string>Twig</string>
<key>BBLMScansFunctions</key>
<false/>
<key>BBLMFunctionScannerDoesFoldsToo</key>
<false/>
<key>BBLMLSuffixMap</key>
<array>
<dict>
<key>BBLMLanguageSuffix</key>
<string>.twig</string>
</dict>
</array>
<key>Language Features</key>
<dict>
<key>Close Block Comments</key>
<false/>
<key>Close Statement Blocks</key>
<false/>
<key>End-of-line Ends Strings 1</key>
<false/>
<key>End-of-line Ends Strings 2</key>
<false/>
<key>Escape Char in Strings 1</key>
<string>\</string>
<key>Escape Char in Strings 2</key>
<string>\</string>
<key>Identifier and Keyword Characters</key>
<string>$0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz-=><</string>
<key>Open Block Comments</key>
<false/>
<key>Open Line Comments</key>
<false/>
<key>Open Statement Blocks</key>
<false/>
<key>Close Strings 1</key>
<false/>
<key>Close Strings 2</key>
<false/>
<key>Open Strings 1</key>
<false/>
<key>Open Strings 2</key>
<false/>
<key>Comment Pattern</key>
<string><![CDATA[
(?x:
((?<![\<"'])\#+(?!\>).*?$) | (?# # Line comment but not <##> bbedit insertion marker)
((?<![:])//.*?$) | (?# // Line comment but not :// urls)
(?s:(\{\#|\/\*+).+?(\#\}|\*\/)) | (?# Block comment)
(<\!--\s*.+\s*-->) (?# Html comment)
)]]></string>
<key>String Pattern</key>
<string><![CDATA[
(?x:
(^|(?<![[:alpha:]]))('(?:[^'\r\n\\]|\\.)*'|"(?:[^"\n\r\\]|\\.)*") ($|(?![[:alpha:]]))
)
]]></string>
<key>Function Pattern</key>
<string><![CDATA[
(?x:
(?P<leadspace>^(\t| )*)
(?P<function>
(public\s+|private\s+|protected\s+)function\s+
(?P<function_name>
[a-zA-Z0-9_]+
)
(?s:.+?)
(\r|\n)(?P=leadspace)\}
)
)
]]>
</string>
<key>Keyword Pattern</key>
<string><![CDATA[
(?x:
(\(|\)) | (?# parentheses)
(\|) | (?# filter operator)
(->) | (?# pointer)
(=>) | (?# array element)
(===? | !==?) | (?# equality operators)
\s(<|<=|>=|>)\s (?# comparison operators)
)]]></string>
</dict>
</dict>
</plist>