doc: fix translations in Italian and Japanese plugin API reference

doc/it/weechat_plugin_api.it.adoc

@@ -311,7 +311,7 @@ Script (Python):
 
 [source,python]
 ----
-# prototype
+# prototipo
 weechat.register(name, author, version, license, description, shutdown_function, charset)
 ----
 
@@ -6984,7 +6984,7 @@ _WeeChat ≥ 1.9._
 // TRANSLATION MISSING
 Return string value of an option property.
 
-Prototype:
+Prototipo:
 
 [source,C]
 ----
@@ -18259,10 +18259,10 @@ Script (Python):
 
 [source,python]
 ----
-# prototype
+# prototipo
 rc = weechat.hdata_compare(hdata, pointer1, pointer2, name, case_sensitive)
 
-# example
+# esempio
 hdata = weechat.hdata_get("buffer")
 buffer1 = weechat.buffer_search("irc", "freenode.#weechat")
 buffer2 = weechat.buffer_search("irc", "freenode.#weechat-fr")

doc/ja/weechat_plugin_api.ja.adoc

@@ -15119,10 +15119,10 @@ struct t_gui_completion *completion = weechat_completion_new (weechat_buffer_sea
 
 [source,python]
 ----
-# prototype
+# プロトタイプ
 completion = weechat.completion_new(buffer)
 
-# example
+# 例
 completion = weechat.completion_new(weechat.buffer_search_main())
 ----
 
@@ -15168,10 +15168,10 @@ if (weechat_completion_search (completion, "/help filt", 10, 1))
 
 [source,python]
 ----
-# prototype
+# プロトタイプ
 rc = weechat.completion_search(completion, data, position, direction)
 
-# example
+# 例
 completion = weechat.completion_new(weechat.buffer_search_main())
 if weechat.completion_search(completion, "/help filt", 10, 1):
     # ...
@@ -15302,10 +15302,10 @@ weechat_completion_free (completion);
 
 [source,python]
 ----
-# prototype
+# プロトタイプ
 weechat.completion_free(completion)
 
-# example
+# 例
 weechat.completion_free(completion)
 ----