Fix Create a new process page accessibility issues

- Added missing aria-label to delete buttons
- Moved hardcoded translation to translation files
- Fix color contrast issues on buttons
- Fix minor alignment issues
- Added missing aria labels to input and select elements

(cherry picked from commit 52c0977489)

src/app/process-page/form/process-parameters/parameter-value-input/string-value-input/string-value-input.component.html

@@ -1,6 +1,6 @@
-<input required #string="ngModel" type="text" name="string-value-{{index}}" class="form-control" id="string-value-{{index}}" [ngModel]="value" (ngModelChange)="setValue($event)"/>
+<input [attr.aria-label]="'process.new.parameter.label' | translate" required #string="ngModel" type="text" name="string-value-{{index}}" class="form-control" id="string-value-{{index}}" [ngModel]="value" (ngModelChange)="setValue($event)"/>
 <div *ngIf="string.invalid && (string.dirty || string.touched)"
-     class="alert alert-danger validation-error">
+     class="alert alert-danger validation-error mb-0">
     <div *ngIf="string.errors.required">
         {{'process.new.parameter.string.required' | translate}}
     </div>

src/app/process-page/form/process-parameters/parameter-value-input/string-value-input/string-value-input.component.scss

@@ -0,0 +1,5 @@
+:host {
+  display: flex;
+  flex-direction: column;
+  gap: calc(var(--bs-spacer) / 2);
+}