Issue #3497951: Consider removing languages from the installer

Closes #3497951

project_template/web/profiles/drupal_cms_installer/css/language-dropdown.css

-.cms-installer__language-button {
-  display: inline-flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 10px;
-  appearance: none;
-  border: 0;
-  background: transparent;
-  font-weight: 600;
-  cursor: pointer;
-
-  @media (max-width: 48em) {
-    font-size: var(--gin-font-size-s);
-  }
-
-  &::before,
-  &::after {
-    display: inline-block;
-    aspect-ratio: 1;
-    content: "";
-    background-color: currentColor;
-    -webkit-mask-repeat: no-repeat;
-    mask-repeat: no-repeat;
-    -webkit-mask-position: center;
-    mask-position: center;
-    -webkit-mask-size: contain;
-    mask-size: contain;
-  }
-
-  &::before {
-    -webkit-mask-image: url('../images/translate.svg');
-    mask-image: url('../images/translate.svg');
-    inline-size: 20px;
-  }
-
-  &::after {
-    -webkit-mask-image: url('../images/chevron-down.svg');
-    mask-image: url('../images/chevron-down.svg');
-    inline-size: 14px;
-  }
-}
-
-.cms-installer__language {
-  position: relative; /* Anchor dropdown. */
-}
-
-.cms-installer__language-dropdown {
-  position: absolute;
-  inset-block-start: 100%;
-  inset-inline-end: 0;
-  z-index: 1;
-  visibility: hidden;
-  opacity: 0;
-  inline-size: min(90vw, 1000px);
-  padding: var(--gin-spacing-m);
-  background: white;
-  border: solid 1px transparent;
-  border-radius: var(--gin-border-m);
-  box-shadow:  var(--gin-shadow-l2);
-  max-block-size: 80dvh;
-  overflow: auto;
-  transition: all 0.2s;
-}
-
-.cms-installer__language-button[aria-expanded="true"] + .cms-installer__language-dropdown {
-  visibility: visible;
-  opacity: 1;
-}
-
-.cms-installer__language-list {
-  margin: 0;
-  padding: 0;
-  list-style: none;
-  display: grid;
-  grid-template-columns: repeat(auto-fit, minmax(min(100%, 20ch), 1fr));
-  gap: .5rem;
-}