check if dictionary is installed when enabling spell checking and at gajim startup. For #2387

src/config.py

@@ -620,6 +620,22 @@ class PreferencesWindow:
 		gajim.config.set('use_speller', active)
 		gajim.interface.save_config()
 		if active:
+			lang = gajim.config.get('speller_language')
+			if not lang:
+				lang = gajim.LANG
+			tv = gtk.TextView()
+			try:
+				spell = gtkspell.Spell(tv, lang)
+			except:
+				dialogs.ErrorDialog(
+					_('Dictionary for lang %s not available') % lang,
+					_('You have to install %s dictionary to use spellchecking, or '
+					'choose another language by setting the speller_language option.'
+					) % lang)
+				gajim.config.set('use_speller', False)
+				widget.set_active(False)
+			else:
+				gajim.config.set('speller_language', lang)
 				self.apply_speller()
 		else:
 			self.remove_speller()

src/gajim.py

@@ -1923,6 +1923,21 @@ class Interface:
 		# get transports type from DB
 		gajim.transport_type = gajim.logger.get_transports_type()
 
+		# test is dictionnary is present for speller
+		if gajim.config.get('use_speller'):
+			lang = gajim.config.get('speller_language')
+			if not lang:
+				lang = gajim.LANG
+			tv = gtk.TextView()
+			try:
+				spell = gtkspell.Spell(tv, lang)
+			except:
+				dialogs.ErrorDialog(
+					_('Dictionary for lang %s not available') % lang,
+					_('You have to install %s dictionary to use spellchecking, or '
+					'choose another language by setting the speller_language option.'
+					) % lang)
+				gajim.config.set('use_speller', False)
 		gobject.timeout_add(100, self.autoconnect)
 		gobject.timeout_add(200, self.process_connections)
 		gobject.timeout_add(500, self.read_sleepy)