style(deposit first step): [AOU-454] change confirm import button

https://issues.unige.ch/browse/AOU-454

src/app/features/deposit/components/presentationals/deposit-form-first-step-type/deposit-form-first-step-type.presentational.html

@@ -48,11 +48,15 @@
       </mat-form-field>
     </ng-template>
 
-    <ng-template [ngIf]="selectedService | isNotNullNorUndefined">
+    <div *ngIf="selectedService | isNotNullNorUndefined"
+         class="import-identifier-wrapper"
+    >
       <mat-form-field *ngIf="formValidationHelper.getFormControl(formRetrieveReferences, formDefinitionRetrieveReferences.identifier) as fd"
                       [appearance]="appearanceInputMaterial"
                       [floatLabel]="positionLabelInputMaterial"
                       solidifyTooltipOnEllipsis
+                      solidifyShortCuts
+                      (onEnter)="getMetadataFromService()"
       >
         <mat-label>{{labelTranslateEnum.identifier | translate}}</mat-label>
         <input [formControl]="fd"
@@ -63,21 +67,21 @@
                matInput
         >
         <mat-error #errors></mat-error>
-        <button (click)="getMetadataFromService()"
-                (keydown.enter)="getMetadataFromService()"
-                *ngIf="fd.value | isNonEmptyString"
-                aria-label="Check"
-                mat-button
-                mat-icon-button
-                matSuffix
-                type="button"
-        >
-          <solidify-icon [iconName]="iconNameEnum.check"
-                         class="size-12"
-          ></solidify-icon>
-        </button>
       </mat-form-field>
-    </ng-template>
+
+      <div class="button-wrapper">
+        <button mat-flat-button
+                class="button-confirm"
+                color="primary"
+                solidifyShortCuts
+                (click)="getMetadataFromService()"
+                (onEnter)="getMetadataFromService()"
+                [disabled]="!(formValidationHelper.getFormControl(formRetrieveReferences, formDefinitionRetrieveReferences.identifier)?.value |
+                isNonEmptyString)"
+        >{{labelTranslateEnum.validate | translate}}
+        </button>
+      </div>
+    </div>
   </div>
 
   <div *ngIf="!isCreation || isImported || formValidationHelper.getFormControl(formRetrieveReferences, formDefinitionRetrieveReferences.importMode)?.value ===