Added about page + help commented

src/main/resources/message_en.properties

@@ -1,5 +1,5 @@
 # general
-window.title=Corpus analyzer
+window.title=Korpeks 1.0
 
 hyperlink.help=Help
 button.language=SL
@@ -13,6 +13,7 @@ tab.characterLevelTabNew=Characters
 tab.wordLevelTab=Word parts
 tab.oneWordAnalysisTab=Words
 tab.stringLevelTabNew2=Word sets
+tab.aboutTab=About
 
 # corpus tab
 label.setCorpusLocation=Set corpus location
@@ -280,3 +281,5 @@ exportFileName.words=words
 exportFileName.wordSets=word-sets
 exportFileName.gram=-gram
 exportFileName.skip=-skip
+
+about.text=Korpeks – Corpus Extraction Tool\nVersion: 1.0 (Last update: 21 March 2019)\nAuthors: Luka Krsnik, Špela Arhar Holdt, Jaka Čibej, Kaja Dobrovoljc, Aleksander\n    Ključevšek, Simon Krek, Marko Robnik Šikonja\n\nThe Korpeks corpus extraction tool is a program for extracting lists from text corpora on the\n    levels of characters, word parts, words, and word sets. The program was developed within\n    the New Grammar of Modern Standard Slovene: Resource and Methods project (J6-8256),\n    which was financially supported by the Slovenian Research Agency between 2017 and 2021.\n\n\nPublisher: Centre for Language Resources and Technologies, University of Ljubljana,\nJožef Stefan Institute,\nFaculty of Computer and Information Science, University of Ljubljana\n\nMaintenance: Centre for Language Resources and Technologies, University of Ljubljana\nThe program is available under the GNU General Public Licence (version 3) at