Add javadoc
remove unused widget
* Use enum for DatabaseDtos
* Extract Database & Taxonomy Dto to new Dtos.java
* Extract Database DTO to Database.proto
* Add JDBC & LIMESURVEY settings
* Use enum for DatabaseDtos
* Extract Database & Taxonomy Dto to new Dtos.java
Add RequiredIcon
Use JDBC & LIMESURVEY database settings
Complemented the SPSS parse errors with the string containing the invalid characters
Merge pull request #275 from obiba/cthiebault/databases

SQL Databases UI
Merge pull request #276 from kazoompa/feature-opal-translation

Complemented the SPSS parse errors with the string containing the invalid characters