Extract i18n from shared UI components (#4834)

* Actionbar i18n

* ui Errors i18n

* Features i18n

* GapPriceSelector i18n

* WIP

* WIP #2

* Update methodDecoding

* ModalBox -> functional

* Signer pages i18n (missed previously)

* Update ModalBox tests

* Update variable

js/src/ui/GasPriceSelector/CustomTooltip/customTooltip.js

@@ -15,6 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 import React, { Component, PropTypes } from 'react';
+import { FormattedMessage } from 'react-intl';
 
 export default class CustomTooltip extends Component {
   static propTypes = {
@@ -41,11 +42,15 @@ export default class CustomTooltip extends Component {
     return (
       <div>
         <p className='label'>
-          { count.toNumber() } transactions
-          with gas price set from
-          <span> { minprice.toFormat(0) } </span>
-          to
-          <span> { maxprice.toFormat(0) } </span>
+          <FormattedMessage
+            id='ui.gasPriceSelector.customTooltip.transactions'
+            defaultMessage='{number} {number, plural, one {transaction} other {transactions}} with gas price set from {minPrice} to {maxPrice}'
+            values={ {
+              number: count.toNumber(),
+              minPrice: <span>{ minprice.toFormat(0) }</span>,
+              maxPrice: <span>{ maxprice.toFormat(0) }</span>
+            } }
+          />
         </p>
       </div>
     );