nvim: Add customised LSP labels

Taken from
https://github.com/lukas-reineke/dotfiles/blob/master/vim/lua/lsp.lua

nvim/.config/nvim/lua/modules/completion.lua

@@ -5,6 +5,22 @@ vim.g.completion_auto_change_source = 1
 vim.g.completion_trigger_on_delete      = 1
 vim.g.completion_matching_ignore_case   = 0
 vim.g.completion_matching_strategy_list = { 'exact', 'substring' }
+vim.g.completion_customize_lsp_label    = {
+    Function  = " [function]",
+    Method    = " [method]",
+    Reference = " [reference]",
+    Enum      = " [enum]",
+    Field     = "ﰠ [field]",
+    Keyword   = " [key]",
+    Variable  = " [variable]",
+    Folder    = " [folder]",
+    Snippet   = " [snippet]",
+    Operator  = " [operator]",
+    Module    = " [module]",
+    Text      = "ﮜ[text]",
+    Class     = " [class]",
+    Interface = " [interface]"
+}
 
 vim.g.completion_chain_complete_list = {
   c = {