Multiple dictionaries use unreadable .trie format instead of .txt

## Problem The following dictionaries use `.trie` binary format and cannot be read as plain text files: - `en_US/en_US.trie` - `en_GB/en_GB.trie` - `en_GB-MIT/en_GB.trie` - `en_GB-legacy/dict/en_GB-legacy.trie` - `en_AU/en_AU.trie` - `en_CA/en_CA.trie` - `en_GB-ise/en_GB.trie` - `scientific_terms_GB/dict/scientific-terms-gb.trie` ## Expected Plain text `.txt` format, like other dictionaries (e.g. `ruby.txt`, `cpp-refined.txt`). ## Related - #5262 - #5263 ## Environment - cspell-dicts version: main branch