If you want to use a different implementation of BBCodeTranslator then yes you'll need to use an ext plugin
In docroot/WEB-INF/ext-impl/src/META-INF/ you create a file called ext-spring.xml
1<?xml version="1.0" encoding="UTF-8"?>
2 3<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
4 <bean id="com.liferay.portal.kernel.parsers.bbcode.BBCodeTranslatorUtil" class="com.liferay.portal.kernel.parsers.bbcode.BBCodeTranslatorUtil">
5 <property name="BBCodeTranslator">
6 <bean class="com.yourcompany.YourImpl" />
7 </property>
8 </bean>
9</bean
com.yourcompany.YourImpl you create under docroot/WEB-INF/ext-impl/src
