The module isn't on the Maven Central Repository, therefore a third-party repository is required.
You have to add the JitPack repository to you project's pom.xml file.
<repositories>
<repository>
<id>jitpack.io</id>
<url>https://jitpack.io</url>
</repository>
</repositories>
And this to your dependencies.
<dependency>
<groupId>com.github.aziascreations</groupId>
<artifactId>module-l10n</artifactId>
<version>-SNAPSHOT</version>
</dependency>
If you are using another build automation tool or if want to download it, go check the JitPack page: https://jitpack.io/#aziascreations/module-versioning/
Firstly, you have to import com.azias.module.l10n.Localizer
in your code.