cleanup: Rename gles2n64 --> gln64 in comments and variables.

Changes to the resources (translations, keys) will be done later.
cleanup: Rename gles2glide64 --> glide64 in comments and variables.

Changes to the resources (translations, keys) will be done later.
cleanup: Rename gles2rice --> rice in comments and variables.

Changes to the resources (translations, keys) will be done later.
res: Updated translations.
res/assets: Change keynames gles2n64 --> gln64.
res/assets: Change keynames gles2glide64 --> glide64.
res/assets: Change keynames gles2rice --> rice.