Add translations in submodule

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "i18n"]
+	path = i18n
+	url = https://tildegit.org/southerntofu/git-build-i18n

README.md

@@ -4,7 +4,11 @@ Rust reimplementation of git-build.sh
 
 # Running
 
-Requires the translation files from git-build.sh. TODO: Use a dedicated repository for translations, with a git submodule
+Requires the translation files to run. They are included in a submodule, you need to use `--recursive` with git:
+
+```
+git clone --recursive https://tildegit.org/southerntofu/git-build.rs
+```
 
 ```
 LANG=fr LOG=debug I18N=~/git-build.sh/i18n/ cargo run --release

i18n

@@ -0,0 +1 @@
+Subproject commit 5fd01cce804b3863abb4f465365df8051ba86ab2