Add English (gb) translation

[mdziekon]

Closes #19

TODO:

• Reformat all polish language files (code style cleanups).
  • New line ending of each file.
  • Trailing whitespaces removal.
  • Weird formatting (eg. values alignment) removal.
  • Language mistakes fixes.
  • Task reward strings are now dynamically generated instead of redundantly hardcoded.
• Remove unused localisation texts from various files
• Make ReCaptcha use default server's language (DEFAULT_LANG)
• Translate all language files to English:
  • aboutpro.lang
  • activate.lang
  • admin.lang
  • alliance.lang
  • attackslist.lang
  • banned.lang
  • bannedUser.lang
  • buddy.lang
  • buildings.lang
  • changelog.lang
  • chat.lang
  • contact.lang
  • converter.lang
  • cookies.lang
  • declaration.lang
  • destroy_rockets.lang
  • email_change.lang
  • empire.lang
  • firstlogin.lang
  • fleet.lang
  • FleetMission_MissileAttack.lang
  • fleetshortcut.lang
  • galacticshop.lang
  • galaxy_ajax.lang
  • galaxy.lang
  • generate_sig.lang
  • infos.lang
  • jumpgate.lang
  • leftmenu.lang
  • login.lang
  • logout.lang
  • lostcode.lang
  • lostpassword.lang
  • merchant.lang
  • messages.lang
  • messageSystem.lang
  • months.lang
  • moon_sim.lang
  • morale_info.lang
  • notes.lang
  • officers.lang
  • overview.lang
  • phalanx.lang
  • polls.lang
  • profile.lang
  • readBattleReport.lang
  • records.lang
  • reftable.lang
  • reg_ajax.lang
  • reg_mainpage.lang
  • report.lang
  • resources.lang
  • rocket_simulator.lang
  • rules.lang
  • rules.definitions.default.lang
  • search.lang
  • settings.lang
  • sfbInfos.lang
  • simulator.lang
  • spyReport.lang
  • stat.lang
  • system.lang
  • tasks_infobox.lang
  • tasks.lang
  • tech.lang
  • texts.lang
  • topmenu.lang
  • worldElements.detailed.lang
  • admin/addMoon.lang
  • admin/alerts_filters.lang
  • admin/alerts.lang
  • admin/autogziplogs.lang
  • admin/autostatbuilder.lang
  • admin/banslist.lang
  • admin/banuser.lang
  • admin/bashDetector.lang
  • admin/browse_actionlogs.lang
  • admin/chatbrowser.lang
  • admin/cron_GarbageCollector.lang
  • admin/declarations_list.lang
  • admin/errorslist.lang
  • admin/FleetControl.lang
  • admin/iplog_addproxy.lang
  • admin/iplog.lang
  • admin/massmessage.lang
  • admin/messagelist.lang
  • admin/planets_resmanager.lang
  • admin/reduceban.lang
  • admin/reports_list.lang
  • admin/settings.lang
  • admin/SFBSettings.lang
  • admin/ship_calculations.lang
  • admin/telemetry.lang
  • admin/unbanuser.lang
  • admin/user_info.lang
  • admin/userdevscanner.lang
  • admin/userlist.lang
  • admin/users_techmanager.lang
• Find and remove all "hardcoded" Polish texts. So far I'm aware of:
  • Timers using "g m s" ("godziny, minuty, sekundy" in Polish), which should depend on the translation.
  • templates/default_template/admin/massmessage_body.tpl template (Closes massmessage_body.tpl - Hardcoded string not in lang file #39)
  • jquery-ui-datepicker-pl JavaScript file (Closes Polish Hardcoded Calendar - AdminPanel - ChangeBan - SelectDate #40)
    • Since the original JS file is available, it should be possible to provide separate .js files for other languages, or even find other ready-to-use translations.
  • Bans log (control panel)
• Set the default language to en
• Add ability to switch the language per user
  • On the "main page" - login, registration, recovery pages
  • At server's installation (both for the installation script and as a server's default lang)
  • At registration
  • In-game (account settings)

Localisation by-products:

• js/jsChronoApplet.js has been refactored to make it more performant (now it uses one WebAPI timer to handle all countdowns, instead of spawning separate timers for each countdown).
• Cron scripts (eg. autostatbuilder.php) are a bit more secure when dealing with password-protected access (empty password is no longer accepted).
• install script has been refactored - simplified branching, better modularisation.
• Registration script has received a fix to correctly generate Multiverse selector & infoboxes (previously, it would render only the last defined Universe's info and selector option).