If you had to create the Motion Templates folder yourself, right click on the folder and Get Info. In the Name & Extension box, make sure it is: "Motion Templates.localized". For the Title Folder, do the same and verify it is "Titles.localized". Once the localized status is set up, you should see the Adjustment Layer appear in FCPX in the Titles Browser under the Adjustment category.
You do *not* need to localize any of the folders lower in the heirarchy than the Effects, Generators, Titles or Transitions folders.
BTW, in all likelihood, once you've established a ".localized" folder, that part of the folder name will simply disappear — it is generally hidden by default.