Vietnamese language (#544)

app/languages/definitions/Vietnamese.yml

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+locale: vi-VN
+dictionaryFile: vi-utf8.csv
+layout:
+  - [SPECIAL] # 0
+  - [PUNCTUATION] # 1
+  - [a, b, c, ă, â, á, ắ, ấ, à, ằ, ầ, ả, ẳ, ẩ, ã, ẵ, ẫ, ạ, ặ, ậ] # 2
+  - [d, e, f, đ, ê, é, ế, è, ề, ẻ, ể, ẽ, ễ, ẹ, ệ] # 3
+  - [g, h, i, í, ì, ỉ, ĩ, ị] # 4
+  - [j, k, l] # 5
+  - [m, n, o, ô, ơ, ó, ố, ớ, ò, ồ, ờ, ỏ, ổ, ở, õ, ỗ, ỡ, ọ, ộ, ợ] # 6
+  - [p, q, r, s] # 7
+  - [t, u, v, ư, ú, ứ, ù, ừ, ủ, ử, ũ, ữ, ụ, ự] # 8
+  - [w, x, y, z, ý, ỳ, ỷ, ỹ, ỵ] # 9

docs/dictionaries/viWordlistReadme.txt

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+Vietnamese dictionary by undertheseanlp
+URL: https://github.com/undertheseanlp/dictionary
+Version: e452f45 (2018-12-10)
+License: https://github.com/undertheseanlp/dictionary/blob/master/LICENSE.txt
+
+Vietnamese wordnet wordlist by zeloru
+URL: https://github.com/zeloru/vietnamese-wordnet/tree/master
+Version: 6ef96b3 (2018-02-05)
+
+VDict.com Vietnamese dictionary
+URL: https://vdict.com/about.php
+
+Hunspell dictionary for Vietnamese
+Version: a5fa019 (2019-05-05)
+URL: https://github.com/wooorm/dictionaries/blob/main/dictionaries/vi/index.dic
+License: https://github.com/wooorm/dictionaries/blob/main/dictionaries/vi/license
+
+Word frequencies obtained from Helium314 dictionaries:
+URL: https://codeberg.org/Helium314/aosp-dictionaries/src/branch/main/wordlists_experimental
+Version: 02004f7120cdb42819ed71d5494f6cd232517a2d (2023-09-16)
+License: https://codeberg.org/Helium314/aosp-dictionaries/src/branch/main/LICENSE