fix(Label): set text and language as not nullable in database

solidify-model/src/main/java/ch/unige/solidify/model/Label.java

@@ -9,12 +9,12 @@
  * it under the terms of the GNU General Public License as
  * published by the Free Software Foundation, either version 2 of the
  * License, or (at your option) any later version.
- * 
+ *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- * 
+ *
  * You should have received a copy of the GNU General Public
  * License along with this program.  If not, see
  * <http://www.gnu.org/licenses/gpl-2.0.html>.
@@ -40,12 +40,12 @@ public class Label implements EmbeddableEntity {
 
   @NotNull
   @Size(max = SolidifyConstants.DB_LONG_STRING_LENGTH)
-  @Column(length = SolidifyConstants.DB_LONG_STRING_LENGTH)
+  @Column(length = SolidifyConstants.DB_LONG_STRING_LENGTH, nullable = false)
   private String text;
 
   @NotNull
   @ManyToOne
-  @JoinColumn(name = SolidifyConstants.DB_LANGUAGE_ID, referencedColumnName = SolidifyConstants.DB_RES_ID)
+  @JoinColumn(name = SolidifyConstants.DB_LANGUAGE_ID, referencedColumnName = SolidifyConstants.DB_RES_ID, nullable = false)
   private Language language;
 
   public String getText() {