Grammar consistency

Most log messages are sentence fragments so make them consistent by
removing periods. Log messages that are expressing urgency with ! or
pending more work with "..." are OK.

lib/pleroma/web/activity_pub/activity_pub_controller.ex

@@ -36,9 +36,9 @@ def inbox(%{assigns: %{valid_signature: true}} = conn, params) do
   def inbox(conn, params) do
     headers = Enum.into(conn.req_headers, %{})
     if !(String.contains?(headers["signature"] || "", params["actor"])) do
-      Logger.info("Signature not from author, relayed message, ignoring.")
+      Logger.info("Signature not from author, relayed message, ignoring")
     else
-      Logger.info("Signature error.")
+      Logger.info("Signature error")
       Logger.info("Could not validate #{params["actor"]}")
       Logger.info(inspect(conn.req_headers))
     end

lib/pleroma/web/http_signatures/http_signatures.ex

@@ -36,7 +36,7 @@ def validate_conn(conn) do
       if validate_conn(conn, public_key) do
         true
       else
-        Logger.debug("Could not validate, re-fetching user and trying one more time.")
+        Logger.debug("Could not validate, re-fetching user and trying one more time")
         # Fetch user anew and try one more time
         with actor_id <- conn.params["actor"],
              {:ok, _user} <- ActivityPub.make_user_from_ap_id(actor_id),

lib/pleroma/web/web_finger/web_finger.ex

@@ -122,7 +122,7 @@ def finger(account) do
       {:ok, data}
     else
       e ->
-        Logger.debug(fn -> "Couldn't finger #{account}." end)
+        Logger.debug(fn -> "Couldn't finger #{account}" end)
         Logger.debug(fn -> inspect(e) end)
         {:error, e}
     end

lib/pleroma/web/websub/websub.ex

@@ -98,7 +98,7 @@ def incoming_subscription_request(user, %{"hub.mode" => "subscribe"} = params) d
 
       {:ok, websub}
     else {:error, reason} ->
-      Logger.debug("Couldn't create subscription.")
+      Logger.debug("Couldn't create subscription")
       Logger.debug(inspect(reason))
 
       {:error, reason}