Fix punctuation in it.js

Keys must match input keys exactly, and trailing colons should be preserved in the translation.
Also tweaked a couple of the comments to point to the right files
(note it's also fine to omit these comments entirely from the translation files,
as the file dist/translation-keys.txt always has up-to-date line references
as of the latest release)

Author: alexcjohnson

lib/locales/it.js

@@ -58,17 +58,17 @@ module.exports = {
         'mean:': 'media:',                                                                             // traces/box/calc.js:133
         'median:': 'mediana:',                                                                               // traces/box/calc.js:128
         'min:': 'min.:',                                                                                    // traces/box/calc.js:129
-        'new text:': 'Nuovo testo:',                                                                                    // traces/box/calc.js:129
-        'upper fence:': 'limite superiore',                                                                                    // traces/box/calc.js:129
-        'lower fence:': 'limite inferiore',                                                                                    // traces/box/calc.js:129
+        'new text:': 'Nuovo testo:',                                                                                    // plots/plots.js:327
+        'upper fence:': 'limite superiore:',                                                                                    // traces/box/calc.js:129
+        'lower fence:': 'limite inferiore:',                                                                                    // traces/box/calc.js:129
         'Turntable rotation': 'Rotazione piattaforma',                                                          // components/modebar/buttons.js:288
         'Toggle Spike Lines': 'Abilita linee di identificazione',                                   // components/modebar/buttons.js:548
         'open:': 'apri:',                                                                              // traces/ohlc/transform.js:136
         'high:': 'alto:',                                                                             // traces/ohlc/transform.js:137
-        'kde:': 'kde:',                                                                              // traces/ohlc/transform.js:138
+        'kde:': 'kde:',                                                                              // traces/violin/calc.js:73
         'low:': 'basso:',                                                                              // traces/ohlc/transform.js:138
-        'incoming flow count: ': 'Flusso in entrata:',                                                // traces/ohlc/transform.js:138
-        'outgoing flow count:: ': 'Flusso in uscita:',                                                // traces/ohlc/transform.js:138
+        'incoming flow count:': 'Flusso in entrata:',                                                // traces/sankey/plot.js:142
+        'outgoing flow count:': 'Flusso in uscita:',                                                // traces/sankey/plot.js:143
         'Toggle show closest data on hover': 'Abilita mostra i dati più vicini al passaggio del mouse',                   // components/modebar/buttons.js:353
     },
     format: {