[Legend of the Five Rings: 4th Edition] New Feature: Adding support for kata, kiho, skill masteries, CSE

Changes / Description
- Updated HTML/CSS to use CSE
- Added new sections for kata, kiho and skill masteries.
- Updated School Techniques, Advantages, Disadvantages to use repeating
  items.

The old single fields are present for the three I moved to repeating
items, they only become hidden if they are empty. I felt this was a
safer migration. Players can take their time to move from one giant
text blob to individual entries.

L5R/sheet.json

@@ -4,6 +4,5 @@
   "authors": "Nick R., Calle. A, and kimurae",
   "instructions": "",
   "preview": "L5Rpreview.png",
-  "legacy": true
+  "legacy": false
 }
-

L5R/translation.json

@@ -82,6 +82,10 @@
   "school-techniques-u": "School Techniques",
   "avantages-u": "Advantages",
   "disadvantages-u": "Disadvantages",
+  "kata-u": "Kata",
+  "kiho-u": "Kiho",
+  "skill-masteries-u": "Skill Masteries",
+  "school-or-alt-path-u": "School / Alternate Path",
   "background-u": "Background",
   "high-skills-u": "High Skills",
   "sentence-ute-u": "U = Untrained Roll | T = Trained Roll | E = Emphasis Roll",