Trying to recognize the language of the Toot to set it correctly if none is provided (#633)

Probability threshold arbitrary set to 85%.
Seems to work enough for French, English and Spanish.
Also tested and with only a few words, probability is low unless there is a very language specific word

Packages/Status/Sources/Status/Editor/StatusEditorViewModel.swift

@@ -1,6 +1,7 @@
 import DesignSystem
 import Env
 import Models
+import NaturalLanguage
 import Network
 import PhotosUI
 import SwiftUI
@@ -126,6 +127,21 @@ public class StatusEditorViewModel: ObservableObject {
                          multiple: pollVotingFrequency.canVoteMultipleTimes,
                          expires_in: pollDuration.rawValue)
       }
+
+      if !hasExplicitlySelectedLanguage {
+          // Attempt language resolution using Natural Language
+          let recognizer = NLLanguageRecognizer()
+          recognizer.processString(statusText.string)
+          // Use languageHypotheses to get the probability with it
+          let hypotheses = recognizer.languageHypotheses(withMaximum: 1)
+          // Assert that 85% probability is enough :)
+          // A one word toot that is en/fr compatible is only ~50% confident, for instance
+          if let (language, probability) = hypotheses.first, probability > 0.85 {
+              // rawValue return the IETF BCP 47 language tag
+              selectedLanguage = language.rawValue
+          }
+      }
+
       let data = StatusData(status: statusText.string,
                             visibility: visibility,
                             inReplyToId: mode.replyToStatus?.id,