Add Slovenian language support (#653)

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Co-authored-by: sspanak <doftor.livain@gmail.com>

app/languages/definitions/Slovenian.yml

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+locale: sl-SI
+dictionaryFile: sl-utf8.csv
+layout:
+  - [SPECIAL] # 0
+  - [PUNCTUATION] # 1
+  - [a, b, c, č, ć] # 2
+  - [d, e, f, đ] # 3
+  - [g, h, i] # 4
+  - [j, k, l] # 5
+  - [m, n, o] # 6
+  - [p, q, r, s, š] # 7
+  - [t, u, v] # 8
+  - [w, x, y, z, ž] # 9

docs/dictionaries/slWordlistReadme.txt

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+Slovenian wordlist 1 by: Fran Ramovš Institute of Slovenian Language - ZRC SAZU
+Version: ZIP exported on 2025-02-25
+Source: http://bos.zrc-sazu.si/besede_en.html
+License: Public domain source from ZRC SAZU, zrc@zrc-sazu.si
+
+Slovenian wordlist 2 by: Aleksander Simonic and Uros Lotric
+Version: 2012-11-30
+Source: https://www.winedt.org/dict.html
+License: https://www.winedt.org/dict/Slovenian.html
+
+Frequencies obtained from LatinIME dictionaries:
+Source: https://android.googlesource.com/platform/packages/inputmethods/LatinIME
+Version: 66093bf509ea92fa31d796326d5f30a8d9582ffe (2023-12-21)
+License: https://android.googlesource.com/platform/packages/inputmethods/LatinIME/+/refs/heads/main/NOTICE
+
+Slovenian word list 3 by: CC-100;
+Version: 2020
+Source: https://data.statmt.org/cc-100/
+References (PDF links are available in the source URL):
+    - Unsupervised Cross-lingual Representation Learning at Scale, Alexis Conneau, Kartikay Khandelwal, Naman Goyal, Vishrav Chaudhary, Guillaume Wenzek, Francisco Guzmán, Edouard Grave, Myle Ott, Luke Zettlemoyer, Veselin Stoyanov, Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics (ACL), p. 8440-8451, July 2020.
+    - CCNet: Extracting High Quality Monolingual Datasets from Web Crawl Data, Guillaume Wenzek, Marie-Anne Lachaux, Alexis Conneau, Vishrav Chaudhary, Francisco Guzmán, Armand Joulin, Edouard Grave, Proceedings of the 12th Language Resources and Evaluation Conference (LREC), p. 4003-4012, May 2020.
+Remark: Only the words that appear at least 4 times were used.