Put overlay menu text in localisation lookups
Added new English language localisation (locales/en.po)
Included missed header file oc3_gettext.hpp in oc3_overlays_menu.cpp
Put overlay button text into localisation lookup (##ovrm_text##, oc3_menu.cpp)
Put main menu button text into localisation lookups (oc3_screen_menu.cpp)
Game top menu text now goes through localisation lookup
Added English localisation of game top menu text
Fixed no newline at end of file on .gitignore and en.po
Added tooltips to game top menu population, currency and date areas, as in real Caesar 3
Added tooltips to game side menu overlays button and min/maximize buttons
Added tooltips to info game buttons
Added Plaza info box, extended road info box to check if it is plaza or normal road
Currency, population and date text in top menu now localisable, added English localisation
Info box text is now word wrapped
Improved granary info box, formatting is fixed, buttons work again
Improved market info box, text now displays, spacing more consistent, worker count shows properly
added 'Special Orders' button to granary info box
Added free house text to English localisation
Free house info box now displays differing messages depending whether there is road access or not
Farm info box improved, added goods icon, added English localisation, all farm types now have info boxes
Fixed some issues with building names in code differing from building names in model, causing building data not to load properly
Added gardens and statues to the build menus
Added info boxes to gardens and statues. Added new basic info box type for these, and other similar, types of info boxes
Added multiple garden types like in C3, in the same arrangement as C3. Gardens now no longer require road access
Merge branch 'master' of https://github.com/tracertong/opencaesar3

Conflicts:
	oc3_building.cpp : resolved
	oc3_building_data.cpp : resolved
	oc3_gui_info_box.cpp : resolved
	oc3_menu.cpp : resolved