Other: Updated translations. [skip ci]

lang/translations/en-gb.po

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+# Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
+#
+#                                     !!! IMPORTANT !!!
+#
+#         Before you edit this file, please keep in mind that contributing to the project
+#                translations is possible ONLY via the Transifex online service.
+#
+#         To submit your translations, visit https://www.transifex.com/ckeditor/ckeditor5.
+#
+#                   To learn more, check out the official contributor's guide:
+#     https://ckeditor.com/docs/ckeditor5/latest/framework/guides/contributing/contributing.html
+#
+msgid ""
+msgstr ""
+"Language-Team: English (United Kingdom) (https://www.transifex.com/ckeditor/teams/11143/en_GB/)\n"
+"Language: en_GB\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+
+msgctxt "Toolbar button tooltip for the Undo feature."
+msgid "Undo"
+msgstr "Undo"
+
+msgctxt "Toolbar button tooltip for the Redo feature."
+msgid "Redo"
+msgstr "Redo"