feat(i18n): add English, Spanish and Galician translations for error messages

infrastructure/src/main/java/com/pablotj/restemailbridge/infrastructure/config/LocaleConfig.java

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+package com.pablotj.restemailbridge.infrastructure.config;
+
+import java.util.List;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.LocaleResolver;
+import org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver;
+
+import java.util.Locale;
+
+@Configuration
+public class LocaleConfig {
+
+    @Bean
+    public LocaleResolver localeResolver() {
+        AcceptHeaderLocaleResolver resolver = new AcceptHeaderLocaleResolver();
+        resolver.setDefaultLocale(Locale.of("en"));
+        resolver.setSupportedLocales(
+                List.of(Locale.of("es"),
+                        Locale.of("en"),
+                        Locale.of("gl"))
+        );
+        return resolver;
+    }
+}

infrastructure/src/main/java/com/pablotj/restemailbridge/infrastructure/config/MessageConfig.java

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+package com.pablotj.restemailbridge.infrastructure.config;
+
+import org.springframework.context.MessageSource;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.support.ResourceBundleMessageSource;
+import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
+
+@Configuration
+public class MessageConfig {
+
+    @Bean
+    public MessageSource messageSource() {
+        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
+        messageSource.setBasename("i18n/messages");
+        messageSource.setDefaultEncoding("UTF-8");
+        messageSource.setUseCodeAsDefaultMessage(false);
+        return messageSource;
+    }
+
+    @Bean
+    public LocalValidatorFactoryBean validator(MessageSource messageSource) {
+        LocalValidatorFactoryBean bean = new LocalValidatorFactoryBean();
+        bean.setValidationMessageSource(messageSource);
+        return bean;
+    }
+}

infrastructure/src/main/resources/i18n/messages.properties

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+email.from.invalid=Sender email must be valid
+email.from.blank=Sender email cannot be blank
+email.from.length=Sender email must be between 4 and 100 characters
+
+email.subject.blank=Subject cannot be blank
+email.subject.length=Subject must be between 1 and 30 characters
+
+email.body.blank=Body cannot be blank
+email.body.length=Body must be between 1 and 4000 characters

infrastructure/src/main/resources/i18n/messages_es.properties

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+email.from.invalid=El remitente debe ser un correo válido
+email.from.blank=El remitente no puede estar vacío
+email.from.length=El remitente debe tener entre 4 y 100 caracteres
+
+email.subject.blank=El asunto no puede estar vacío
+email.subject.length=El asunto debe tener entre 1 y 30 caracteres
+
+email.body.blank=El cuerpo no puede estar vacío
+email.body.length=El cuerpo debe tener entre 1 y 4000 caracteres

infrastructure/src/main/resources/i18n/messages_gl.properties

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+email.from.invalid=O remitente debe ser un correo válido
+email.from.blank=O remitente non pode estar baleiro
+email.from.length=O remitente debe ter entre 4 e 100 caracteres
+
+email.subject.blank=O asunto non pode estar baleiro
+email.subject.length=O asunto debe ter entre 1 e 30 caracteres
+
+email.body.blank=O corpo non pode estar baleiro
+email.body.length=O corpo debe ter entre 1 e 4000 caracteres