New: Wrap specifications in Custom Format modals

(cherry picked from commit 7b8d606a1bed6257d7942de47576c1505fd9cb57)

Towards #3570

frontend/src/Settings/CustomFormats/CustomFormats/EditCustomFormatModalContent.css

@@ -25,3 +25,8 @@
   border-radius: 4px;
   background-color: var(--cardCenterBackgroundColor);
 }
+
+.customFormats {
+  display: flex;
+  flex-wrap: wrap;
+}

frontend/src/Settings/CustomFormats/CustomFormats/EditCustomFormatModalContent.css.d.ts

@@ -3,6 +3,7 @@
 interface CssExports {
   'addSpecification': string;
   'center': string;
+  'customFormats': string;
   'deleteButton': string;
   'rightButtons': string;
 }