Fix #6715: Make catalan words with the L geminate letter work in hashtags (#6741)

app/models/tag.rb

@@ -12,7 +12,7 @@
 class Tag < ApplicationRecord
   has_and_belongs_to_many :statuses
 
-  HASHTAG_NAME_RE = '[[:word:]_]*[[:alpha:]_][[:word:]_]*'
+  HASHTAG_NAME_RE = '[[:word:]_]*[[:alpha:]_·][[:word:]_]*'
   HASHTAG_RE = /(?:^|[^\/\)\w])#(#{HASHTAG_NAME_RE})/i
 
   validates :name, presence: true, uniqueness: true, format: { with: /\A#{HASHTAG_NAME_RE}\z/i }