web/i18n/error: fix punctuation in no matching format error

web/i18n/en/error.json

@@ -47,7 +47,7 @@
     "api.content.post.private": "this post is from a private account, so i can't access it. have you pasted the right link?",
     "api.content.post.age": "this post is age-restricted, so i can't access it anonymously. have you pasted the right link?",
 
-    "api.youtube.no_matching_format": "youtube didn't return a valid video + audio format combo. either video or audio is missing. formats for this video may be re-encoding on youtube's side, or something went wrong when parsing them.",
+    "api.youtube.no_matching_format": "youtube didn't return a valid video + audio format combo. either video or audio is missing. formats for this video may be re-encoding on youtube's side or something went wrong when parsing them.",
     "api.youtube.decipher": "youtube updated its decipher algorithm and i couldn't extract the info about the video.\n\ntry again in a few seconds, but if issue sticks, contact us for support.",
     "api.youtube.login": "couldn't get this video because youtube labeled me as a bot. this is potentially caused by the processing instance not having any active account tokens. try again in a few seconds, but if it still doesn't work, tell the instance owner about this error!",
     "api.youtube.token_expired": "couldn't get this video because the youtube token expired and i couldn't refresh it. try again in a few seconds, but if it still doesn't work, tell the instance owner about this error!",