Use lexical-binding in of all lisp/language

* lisp/international/titdic-cnv.el (pinyin-convert):
Enable lexical-binding in the generated file(s).

* lisp/language/ethio-util.el: Use lexical-binding.
(ethio-tex-to-fidel-buffer): Use `inhibit-read-only`.  Remove unused
vars `p` and `ch`.

* lisp/language/hanja-util.el: Use lexical-binding.

* lisp/language/ind-util.el: Use lexical-binding.
(indian-translate-region): Actually use the `from` and `to` arguments.
(<toplevel>): Use `dlet`.  Remove unused var `current-repertory`.
(indian-2-column-to-ucs-region): Remove unused var `pos`.

* lisp/language/japan-util.el: Use lexical-binding.
(japanese-katakana-region, japanese-hiragana-region)
(japanese-zenkaku-region): Remove unused var `next`.

* lisp/language/korea-util.el: Use lexical-binding.

* lisp/language/lao-util.el: Use lexical-binding.
(lao-composition-function): Remove unused var `glyph`.

* lisp/language/thai-util.el: Use lexical-binding.
(thai-composition-function): Remove unused var `glyph`.

* lisp/language/thai-word.el: Use lexical-binding.
(thai-forward-word): Remove unused var `tail`.

* lisp/language/tibet-util.el: Use lexical-binding.
(tibetan-add-components): Remove unused var `tmp`.
(tibetan-compose-region): Remove unused vars `str`, `result`, `chars`.

* lisp/language/viet-util.el:
* lisp/language/tv-util.el:
* lisp/language/cyril-util.el:
* lisp/language/china-util.el: Use lexical-binding.

lisp/language/misc-lang.el

@@ -137,9 +137,9 @@ thin (i.e. 1-dot width) space."
  composition-function-table
  '(#x600 . #x74F)
  (list (vector "[\u200C\u200D][\u0600-\u074F\u200C\u200D]+"
-               1 'arabic-shape-gstring)
+               1 #'arabic-shape-gstring)
        (vector "[\u0600-\u074F\u200C\u200D]+"
-               0 'arabic-shape-gstring)))
+               0 #'arabic-shape-gstring)))
 
 ;; The Egyptian Hieroglyph Format Controls were introduced in Unicode
 ;; Standard v12.0.  Apparently, they are not yet well supported in
@@ -186,13 +186,13 @@ thin (i.e. 1-dot width) space."
                  ;; doesn't support these controls, the glyphs are
                  ;; displayed individually, and not as a single
                  ;; grapheme cluster.
-                 1 'font-shape-gstring)))
+                 1 #'font-shape-gstring)))
   ;; Grouping controls
   (set-char-table-range
    composition-function-table
    #x13437
    (list (vector "\U00013437[\U00013000-\U0001343F]+"
-                 0 'egyptian-shape-grouping))))
+                 0 #'egyptian-shape-grouping))))
 
 (provide 'misc-lang)