build: update build/i18n-* tools

modify i18n-add-language.sh so it can:
- be run from any path
- bootstrap any (or all) po folder(s) with existing language(s)
- (partially) update luci.mk with new languages

deprecate build/i18n-init.sh

Signed-off-by: Paul Donald <newtwen@gmail.com>

luci.mk

@@ -18,7 +18,7 @@ LUCI_MINIFY_LUA?=1
 LUCI_MINIFY_CSS?=1
 LUCI_MINIFY_JS?=1
 
-# Language code titles
+#LUCI_LANG_START
 LUCI_LANG.ar=العربية (Arabic)
 LUCI_LANG.bg=български (Bulgarian)
 LUCI_LANG.bn_BD=বাংলা (Bengali)
@@ -42,8 +42,8 @@ LUCI_LANG.ms=Bahasa Melayu (Malay)
 LUCI_LANG.nb_NO=Norsk (Norwegian)
 LUCI_LANG.nl=Nederlands (Dutch)
 LUCI_LANG.pl=Polski (Polish)
-LUCI_LANG.pt_BR=Português do Brasil (Brazilian Portuguese)
 LUCI_LANG.pt=Português (Portuguese)
+LUCI_LANG.pt_BR=Português do Brasil (Brazilian Portuguese)
 LUCI_LANG.ro=Română (Romanian)
 LUCI_LANG.ru=Русский (Russian)
 LUCI_LANG.sk=Slovenčina (Slovak)
@@ -53,6 +53,7 @@ LUCI_LANG.uk=Українська (Ukrainian)
 LUCI_LANG.vi=Tiếng Việt (Vietnamese)
 LUCI_LANG.zh_Hans=简体中文 (Chinese Simplified)
 LUCI_LANG.zh_Hant=繁體中文 (Chinese Traditional)
+#LUCI_LANG_END
 
 # Submenu titles
 LUCI_MENU.col=1. Collections
@@ -130,10 +131,10 @@ include $(INCLUDE_DIR)/package.mk
 
 # LUCI_SUBMENU: the submenu-item below the LuCI top-level menu inside OpenWrt menuconfig
 #               usually one of the LUCI_MENU.* definitions
-# LUCI_SUBMENU_DEFAULT: the regular SUBMENU defined by LUCI_TYPE or derrived from the packagename
-# LUCI_SUBMENU_FORCED: manually forced value SUBMENU to set to by explicit definiton
+# LUCI_SUBMENU_DEFAULT: the regular SUBMENU defined by LUCI_TYPE or derived from the packagename
+# LUCI_SUBMENU_FORCED: manually forced value SUBMENU to set to by explicit definition
 #                      can be any string, "none" disables the creation of a submenu
-#                      most usefull in combination with LUCI_CATEGORY, to make the package appear
+#                      most useful in combination with LUCI_CATEGORY, to make the package appear
 #                      anywhere in the menu structure
 LUCI_SUBMENU_DEFAULT=$(if $(LUCI_MENU.$(LUCI_TYPE)),$(LUCI_MENU.$(LUCI_TYPE)),$(LUCI_MENU.app))
 LUCI_SUBMENU=$(if $(LUCI_SUBMENU_FORCED),$(LUCI_SUBMENU_FORCED),$(LUCI_SUBMENU_DEFAULT))