Add unaccent postgresql function in search engine.

pom.xml

@@ -64,6 +64,12 @@
 			<artifactId>commons-lang</artifactId>
 			<version>2.3</version>
 		</dependency>
+		<!-- https://mvnrepository.com/artifact/commons-lang/commons-lang -->
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-lang3</artifactId>
+			<version>3.7</version>
+		</dependency>
 	</dependencies>
 
 	<build>