[ngrams] add offline ordering by term

src/Gargantext/Components/NgramsTable.purs

@@ -391,6 +391,8 @@ loadedNgramsTableSpec = Thermite.simpleSpec performAction render
           case convOrderBy <$> params.orderBy of
             Just ScoreAsc  -> A.sortWith \x -> (snd x)        ^. _NgramsElement <<< _occurrences
             Just ScoreDesc -> A.sortWith \x -> Down $ (snd x) ^. _NgramsElement <<< _occurrences
+            Just TermAsc   -> A.sortWith \x -> (snd x)        ^. _NgramsElement <<< _ngrams
+            Just TermDesc  -> A.sortWith \x -> Down $ (snd x) ^. _NgramsElement <<< _ngrams
             _              -> identity -- the server ordering is enough here
 
         rows :: T.Rows

src/Gargantext/Components/NgramsTable/Core.purs

@@ -180,14 +180,14 @@ _list = prop (SProxy :: SProxy "list")
 
 derive instance newtypeNgramsElement :: Newtype NgramsElement _
 
-_NgramsElement    :: Iso' NgramsElement {
-      children    :: Set NgramsTerm
-    , list        :: TermList
-    , ngrams      :: NgramsTerm
-    , occurrences :: Int
-    , parent      :: Maybe NgramsTerm
-    , root        :: Maybe NgramsTerm
-    }
+_NgramsElement  :: Iso' NgramsElement {
+    children    :: Set NgramsTerm
+  , list        :: TermList
+  , ngrams      :: NgramsTerm
+  , occurrences :: Int
+  , parent      :: Maybe NgramsTerm
+  , root        :: Maybe NgramsTerm
+  }
 _NgramsElement = _Newtype
 
 instance decodeJsonNgramsElement :: DecodeJson NgramsElement where