doc instal debianl: add install procedure for semantic search (#442)

Author: komainu8

_po/ja/install/debian.po

@@ -112,6 +112,22 @@ msgid ""
 "```"
 msgstr ""
 
+msgid ""
+"If you want to use [`<&@*>` operator](https://pgroonga.github.io/reference/"
+"operators/semantic-distance-v2.html) or [`&@*` operator](https://pgroonga."
+"github.io/reference/operators/semantic-search-v2.html) for semantic search, "
+"you also need to install `groonga-plugin-lamguage-model` package:"
+msgstr ""
+"セマンティックサーチ用に、[`<&@*>`演算子](https://pgroonga.github.io/ja/"
+"reference/operators/semantic-distance-v2.html) または、 [`&@*`演算子]"
+"(https://pgroonga.github.io/ja/reference/operators/semantic-search-v2.html)"
+
+msgid ""
+"```console\n"
+"$ sudo apt install -y -V groonga-plugin-lamguage-model\n"
+"```"
+msgstr ""
+
 msgid "Create a database:"
 msgstr "データベースを作成します。"
 

install/debian.md

@@ -61,6 +61,12 @@ If you want to use [MeCab](http://taku910.github.io/mecab/) based tokenizer, you
 $ sudo apt install -y -V groonga-tokenizer-mecab
 ```
 
+If you want to use [`<&@*>` operator](https://pgroonga.github.io/reference/operators/semantic-distance-v2.html) or [`&@*` operator](https://pgroonga.github.io/reference/operators/semantic-search-v2.html) for semantic search, you also need to install `groonga-plugin-lamguage-model` package:
+
+```console
+$ sudo apt install -y -V groonga-plugin-lamguage-model
+```
+
 Create a database:
 
 ```console

ja/install/debian.md

@@ -61,6 +61,12 @@ $ sudo apt install -y -V postgresql-13-pgdg-pgroonga
 $ sudo apt install -y -V groonga-tokenizer-mecab
 ```
 
+セマンティックサーチ用に、[`<&@*>`演算子](https://pgroonga.github.io/ja/reference/operators/semantic-distance-v2.html) または、 [`&@*`演算子](https://pgroonga.github.io/ja/reference/operators/semantic-search-v2.html)
+
+```console
+$ sudo apt install -y -V groonga-plugin-lamguage-model
+```
+
 データベースを作成します。
 
 ```console