[RFC] Multi-language firmware (second try) (#941)

* Impl. sectioned font table in firmware

* make_translation.py: Extract build_symbol_conversion_table function

* Put translation indices and strings in a struct

* Move translation objcopy step to Python

* Impl. multi-language firmware demo

* Impl. strings-compressed multi-lang firmware demo

* Add font compression to multi-lang demo

* Refactor Makefile a bit

* Fix rules for make < 4.3

* Add more multi-lang groups

* Add Pinecil multi-lang CI build

* Add lzfx compression license text

* Remote multi-language demo group

* Fix build after merge

* Import code from BriefLZ

* Change brieflz for our use case

* Change compression to use brieflz

* Remove lzfx code

* Update license file for brieflz

* Exclude brieflz files from format check

* Add BriefLZ test

Translations/translation_CS.json

@@ -305,6 +305,13 @@
 				"duration"
 			],
 			"desc": "Keep-awake-pulse duration (x 250ms)"
+		},
+		"LanguageSwitch": {
+			"text2": [
+				"Language:",
+				" CS       Český"
+			],
+			"desc": ""
 		}
 	}
 }