🐛 Fixed editor unable to handle non-latin IME languages

closes TryGhost/Ghost#12268

- see the referenced issue for discussion on the many issues with
  non-latin IME input
- this has been a long term bug which needed a patch in upstream
  mobiledoc-kit
- the fixes were released upstream in 0.12.5, so we've merged a
  contributor PR to our mobiledoc-kit fork and released v0.12.5-ghost.1
- in testing, this seems to fix a lot of the input issues people were
  seeing

package.json

@@ -33,7 +33,7 @@
     "@tryghost/helpers": "1.1.34",
     "@tryghost/kg-clean-basic-html": "1.0.10",
     "@tryghost/kg-parser-plugins": "1.0.10",
-    "@tryghost/mobiledoc-kit": "0.12.4-ghost.1",
+    "@tryghost/mobiledoc-kit": "0.12.5-ghost.1",
     "@tryghost/string": "0.1.14",
     "@tryghost/timezone-data": "0.2.32",
     "autoprefixer": "10.0.2",

yarn.lock

@@ -1510,10 +1510,10 @@
   dependencies:
     "@tryghost/kg-clean-basic-html" "^1.0.10"
 
-"@tryghost/mobiledoc-kit@0.12.4-ghost.1":
-  version "0.12.4-ghost.1"
-  resolved "https://registry.yarnpkg.com/@tryghost/mobiledoc-kit/-/mobiledoc-kit-0.12.4-ghost.1.tgz#32060242b4c7e787a9605ba856454c6a26141925"
-  integrity sha512-c4aheSWH2Y7x4uSkAx08gbtvuEgPGjlu6v+FeUdSJZ1blEd+knL3zTcUAfeSiM6rgLEHxlNWtt+KFwotdf6rTA==
+"@tryghost/mobiledoc-kit@0.12.5-ghost.1":
+  version "0.12.5-ghost.1"
+  resolved "https://registry.yarnpkg.com/@tryghost/mobiledoc-kit/-/mobiledoc-kit-0.12.5-ghost.1.tgz#f79b0f9a9b93eb100fd3dc1c02b343d5d334f4e0"
+  integrity sha512-6WZ2VAXh6mQefeCYnlCle9bvWrFIq0X85A17af1nYiFB/F9vBYOZhGV6GQCzCBE1EbOYkLlHM0LvXZu1KS7K4A==
   dependencies:
     mobiledoc-dom-renderer "0.7.0"
     mobiledoc-text-renderer "0.4.0"