Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
	Dockerfile
	app/javascript/packs/common.js
	config/webpack/loaders/sass.js
	config/webpack/shared.js
	db/schema.rb
	package.json
	yarn.lock

A lot of the conflicts come from updating webpack.

Even though upstream deleted app/javascript/packs/common.js, I kept
glitch-soc's version as it unifies JS/CSS packs behavior across flavours.

Ported glitch changes to webpack 4.x

app/lib/language_detector.rb

@@ -3,12 +3,16 @@
 class LanguageDetector
   include Singleton
 
+  CHARACTER_THRESHOLD = 140
+
   def initialize
     @identifier = CLD3::NNetLanguageIdentifier.new(1, 2048)
   end
 
   def detect(text, account)
-    detect_language_code(text) || default_locale(account)
+    input_text = prepare_text(text)
+    return if input_text.blank?
+    detect_language_code(input_text) || default_locale(account)
   end
 
   def language_names
@@ -23,8 +27,13 @@ class LanguageDetector
     simplify_text(text).strip
   end
 
+  def unreliable_input?(text)
+    text.size < CHARACTER_THRESHOLD
+  end
+
   def detect_language_code(text)
-    result = @identifier.find_language(prepare_text(text))
+    return if unreliable_input?(text)
+    result = @identifier.find_language(text)
     iso6391(result.language.to_s).to_sym if result.reliable?
   end
 
@@ -66,6 +75,6 @@ class LanguageDetector
   end
 
   def default_locale(account)
-    account.user_locale&.to_sym
+    account.user_locale&.to_sym || I18n.default_locale
   end
 end

app/lib/potential_friendship_tracker.rb

@@ -12,6 +12,8 @@ class PotentialFriendshipTracker
 
   class << self
     def record(account_id, target_account_id, action)
+      return if account_id == target_account_id
+
       key    = "interactions:#{account_id}"
       weight = WEIGHTS[action]