cleanup fr and en translation after rebase

- ice floe and boxes are redundant with the new defaults
- custom prerequisites are now also translatable
ra: Id cleanup
ra: minor corrections
cnc: tooltips translation (french)
minor error: APC is strong against infantery
l10n: up-to-date Russian "rules"
l10n: ra: fix Russian chrome (up-to-date)
l10n: fix "requires" text
l10n: translated missed lines to Russian
l10n: ra: ru: ready and on_hold text
l10n: ra: ru: fix
cnc/ra: minor translation corrections (french)
ra: many minor corrections
cnc-en: two small precisions
cnc-fr: small translation corrections
added German ra translation including small fixes

- don't translate dropdown chrome yaml (no text)
- remove spurious external port text (should be numerical)
- use msloicon2 workaround only for English translation
- use aftermath/counter-strike mix files to avoid conflicts
- remove tooltip from fake radar dome as it might reveal it
- fix missing allies/soviet name string in fr/en
- use textless icons only when l10n does not provide them
small corrections (french)
adding myself to AUTHORS
fix OpenRA.Editor.exe crash related to missing OpenRA l10n