fix(lsp): ltex_plus → ltex_ls_plus

- Naming conflicts with lspconfig: the `filetypes` field was overwritten
  by lspconfig.

lsp/ltex_ls_plus.lua

@@ -0,0 +1,70 @@
+local language_id_mapping = {
+  bib = 'bibtex',
+  pandoc = 'markdown',
+  plaintex = 'tex',
+  rnoweb = 'rsweave',
+  rst = 'restructuredtext',
+  tex = 'latex',
+  text = 'plaintext',
+  norg = 'neorg',
+}
+
+local function get_language_id(_, filetype)
+  return language_id_mapping[filetype] or filetype
+end
+
+return {
+  cmd = { 'ltex-ls-plus' },
+  filetypes = {
+    'markdown',
+    'pandoc',
+    'latex',
+    'text',
+    'norg',
+    'gitcommit',
+    'jj',
+    'jjdescription',
+    'rst',
+    'typst'
+  },
+  get_language_id = get_language_id,
+  single_file_support = true,
+  settings = {
+    ltex = {
+      enabled = {
+        'markdown',
+        'pandoc',
+        'latex',
+        'text',
+        'norg',
+        'gitcommit',
+        'jj',
+        'jjdescription',
+        'rst',
+        'typst'
+      },
+      language = "auto",
+      diagnosticSeverity = "information",
+      checkFrequency = "save",
+      sentenceCacheSize = 2000,
+      additionalRules = {
+        enablePickyRules = true,
+        motherTongue = "fr",
+      },
+      enabledRules = {
+        en = { "EN_CONSISTENT_APOS" },
+      },
+      disabledRules = {
+        fr = { "APOS_TYP", "FRENCH_WHITESPACE", "CHANGE", "ISSUE", },
+        en = { "DASH_RULE", "TWO_HYPHENS", "CHANGE", "ISSUE", "CHECK",
+          "ACTUALLY", "CONSISTENT", },
+      },
+      dictionary = {
+        fr = { "CryptPad", "Chouhartem",
+          -- field names
+          "authors", "categories", "created", "updated", "title", "meta" },
+        en = { "CryptPad", },
+      }
+    }
+  }
+}