Add host language to YouTube requests

src/invidious.cr

@@ -1817,7 +1817,7 @@ get "/api/v1/comments/:id" do |env|
   if source == "youtube"
     client = make_client(YT_URL)
     headers = HTTP::Headers.new
-    html = client.get("/watch?v=#{id}&bpctr=#{Time.new.epoch + 2000}&disable_polymer=1")
+    html = client.get("/watch?v=#{id}&bpctr=#{Time.new.epoch + 2000}&gl=US&hl=en&disable_polymer=1")
 
     headers["cookie"] = html.cookies.add_request_headers(headers)["cookie"]
     headers["content-type"] = "application/x-www-form-urlencoded"
@@ -2038,7 +2038,7 @@ get "/api/v1/insights/:id" do |env|
 
   client = make_client(YT_URL)
   headers = HTTP::Headers.new
-  html = client.get("/watch?v=#{id}&disable_polymer=1")
+  html = client.get("/watch?v=#{id}&gl=US&hl=en&disable_polymer=1")
 
   headers["cookie"] = html.cookies.add_request_headers(headers)["cookie"]
   headers["content-type"] = "application/x-www-form-urlencoded"

src/invidious/playlists.cr

@@ -46,7 +46,7 @@ def fetch_playlist_videos(plid, page, video_count)
     if page > 1
       videos = [] of PlaylistVideo
     else
-      response = client.get("/playlist?list=#{plid}&disable_polymer=1")
+      response = client.get("/playlist?list=#{plid}&gl=US&hl=en&disable_polymer=1")
       document = XML.parse_html(response.body)
       nodeset = document.xpath_nodes(%q(.//tr[contains(@class, "pl-video")]))
 
@@ -142,7 +142,7 @@ def fetch_playlist(plid)
     plid = "UU#{plid.lchop("UC")}"
   end
 
-  response = client.get("/playlist?list=#{plid}&disable_polymer=1")
+  response = client.get("/playlist?list=#{plid}&hl=en&disable_polymer=1")
   if response.status_code != 200
     raise "Invalid playlist."
   end

src/invidious/search.cr

@@ -89,7 +89,7 @@ def search(query, page = 1, search_params = produce_search_params(content_type:
     return {0, [] of SearchItem}
   end
 
-  html = client.get("/results?q=#{URI.escape(query)}&page=#{page}&sp=#{search_params}&disable_polymer=1").body
+  html = client.get("/results?q=#{URI.escape(query)}&page=#{page}&sp=#{search_params}&hl=en&disable_polymer=1").body
   if html.empty?
     return {0, [] of SearchItem}
   end